Consolidated Balance Sheet
| Concept | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Consolidated balance sheet | |||||||||||||||||||||||||||||||||||||||||||||
| Balance sheet | |||||||||||||||||||||||||||||||||||||||||||||
| Assets | |||||||||||||||||||||||||||||||||||||||||||||
| Current assets | |||||||||||||||||||||||||||||||||||||||||||||
| Cash and deposits | — | — | — | — | — | — | — | — | 
                                                9,897,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,333,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                4,537,579,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                7,844,649,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Accounts receivable - trade | — | — | — | — | — | — | — | — | 
                                                492,885,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                428,642,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Raw materials and supplies | — | — | — | — | — | — | — | — | 
                                                187,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                174,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Other | — | — | — | — | — | — | — | — | 
                                                316,308,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                124,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                91,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                391,545,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Current assets | — | — | — | — | — | — | — | — | 
                                                10,893,887,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,457,157,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                4,629,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                8,839,683,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Non-current assets | |||||||||||||||||||||||||||||||||||||||||||||
| Property, plant and equipment | — | — | — | — | — | — | — | — | 
                                                2,653,584,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                687,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                694,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,333,103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Land | — | — | — | — | — | — | — | — | 
                                                365,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                318,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                318,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                365,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Other, net | — | — | — | — | — | — | — | — | 
                                                319,970,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                15,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                23,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                147,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Property, plant and equipment | |||||||||||||||||||||||||||||||||||||||||||||
| Buildings and structures | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Buildings and structures, net | — | — | — | — | — | — | — | — | 
                                                1,968,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                353,754,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                353,058,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,819,881,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Own-used assets | |||||||||||||||||||||||||||||||||||||||||||||
| Other | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Accumulated depreciation | — | — | — | — | — | — | — | — | 
                                                -3,400,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -3,115,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Intangible assets | |||||||||||||||||||||||||||||||||||||||||||||
| Other intangible assets | |||||||||||||||||||||||||||||||||||||||||||||
| Other | — | — | — | — | — | — | — | — | 
                                                3,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,769,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                2,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                3,557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Intangible assets | — | — | — | — | — | — | — | — | 
                                                3,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,769,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                2,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                3,557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Investments and other assets | |||||||||||||||||||||||||||||||||||||||||||||
| Investment securities | — | — | — | — | — | — | — | — | 
                                                105,059,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                2,135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                136,809,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Deferred tax assets | — | — | — | — | — | — | — | — | 
                                                264,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                187,921,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Other | — | — | — | — | — | — | — | — | 
                                                651,748,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                34,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                34,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                559,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Allowance for doubtful accounts | — | — | — | — | — | — | — | — | 
                                                -135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -32,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                -135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Investments and other assets | — | — | — | — | — | — | — | — | 
                                                1,021,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                656,847,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                2,123,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                884,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Non-current assets | — | — | — | — | — | — | — | — | 
                                                3,678,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,347,179,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                2,820,778,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                3,221,224,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Assets | — | — | — | — | — | — | — | — | 
                                                14,572,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,804,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                7,450,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                12,060,907,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Liabilities | |||||||||||||||||||||||||||||||||||||||||||||
| Current liabilities | |||||||||||||||||||||||||||||||||||||||||||||
| Notes and accounts payable - trade | — | — | — | — | — | — | — | — | 
                                                1,258,434,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                670,320,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Deposits received | — | — | — | — | — | — | — | — | — | — | — | 
                                                13,999,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                12,253,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Income taxes payable | — | — | — | — | — | — | — | — | 
                                                633,838,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,214,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                1,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                104,401,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Accounts payable - other | — | — | — | — | — | — | — | — | 
                                                902,060,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                21,853,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                26,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                670,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Current portion of long-term borrowings | — | — | — | — | — | — | — | — | 
                                                10,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                10,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                124,992,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                124,992,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Other | — | — | — | — | — | — | — | — | 
                                                1,134,101,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                14,186,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                6,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                959,161,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Current liabilities | — | — | — | — | — | — | — | — | 
                                                3,938,882,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                64,701,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                171,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,529,643,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Non-current liabilities | |||||||||||||||||||||||||||||||||||||||||||||
| Long-term borrowings | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                10,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                10,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Deferred tax liabilities | — | — | — | — | — | — | — | — | — | — | — | 
                                                928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Provision for retirement benefits for directors (and other officers) | — | — | — | — | — | — | — | — | 
                                                542,710,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                492,710,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                467,368,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                517,368,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Other | — | — | — | — | — | — | — | — | 
                                                188,380,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                3,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                214,201,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Non-current liabilities | — | — | — | — | — | — | — | — | 
                                                731,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                497,048,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                481,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                742,017,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Liabilities | — | — | — | — | — | — | — | — | 
                                                4,669,973,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                561,749,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                652,751,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                3,271,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Liabilities and net assets | |||||||||||||||||||||||||||||||||||||||||||||
| Shareholders' equity | — | — | — | — | — | — | — | — | 
                                                9,899,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,240,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                6,796,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                8,788,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Share capital | — | — | — | — | — | — | — | — | 
                                                361,315,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                361,315,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                336,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                336,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Capital surplus | — | — | — | — | — | — | — | — | 
                                                389,420,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                389,420,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                364,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                364,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Retained earnings | — | — | — | — | — | — | — | — | 
                                                9,649,596,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,990,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                6,096,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                8,088,460,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Treasury shares | — | — | — | — | — | — | — | — | 
                                                -500,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -500,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                -712,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -712,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Valuation and translation adjustments | — | — | — | — | — | — | — | — | 
                                                2,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                1,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Valuation difference on available-for-sale securities | — | — | — | — | — | — | — | — | 
                                                2,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                1,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Net assets | 
                                                6,240,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                389,420,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -500,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -500,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                389,420,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                361,315,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,902,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,899,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,242,587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                361,315,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,649,596,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,990,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                336,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                336,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,096,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,788,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,797,573,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                364,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -712,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,789,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                364,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -712,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,796,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,088,460,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                364,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -712,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -712,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,038,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                335,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,246,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                364,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,247,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                335,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,075,214,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,547,265,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,374,805,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,074,176,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | — | — | — | — | — | — | — | — | 
                                                14,572,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,804,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                7,450,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                12,060,907,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Net assets | |||||||||||||||||||||||||||||||||||||||||||||
| Shareholders' equity | |||||||||||||||||||||||||||||||||||||||||||||
| Valuation and translation adjustments |