Semi-Annual Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Semi-annual balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                6,552,026,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,584,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                122,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                99,140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                50,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,927,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -6,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,069,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                8,073,855,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,217,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Prepaid expenses | 
                                                576,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                458,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Property, plant and equipment | 
                                                4,235,708,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,273,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings | — | — | 
| Buildings, net | 
                                                827,968,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                835,025,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Structures | — | — | 
| Structures, net | 
                                                5,749,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,276,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery and equipment | — | — | 
| Machinery and equipment, net | 
                                                1,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Vehicles | — | — | 
| Vehicles, net | 
                                                4,526,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,033,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Tools, furniture and fixtures | — | — | 
| Tools, furniture and fixtures, net | 
                                                1,633,778,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,673,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,710,972,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,710,972,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | — | — | 
| Leased assets, net | 
                                                8,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                43,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                240,466,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                267,176,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Software | 
                                                229,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                256,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                10,716,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,716,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                76,319,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                972,662,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,003,565,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments in capital | 
                                                605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term loans receivable | 
                                                1,078,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                290,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Distressed receivables | 
                                                83,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                83,554,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term prepaid expenses | 
                                                209,737,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                156,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                301,915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                304,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                152,383,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                193,399,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -83,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -83,554,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                5,448,837,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,544,522,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                13,522,693,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,762,244,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Accounts payable - trade | 
                                                632,623,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                880,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                4,006,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,006,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                73,802,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                121,716,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                1,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                278,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Advances received | 
                                                6,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,131,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                5,990,629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,261,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                249,265,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                197,665,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                230,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                208,842,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                6,837,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,077,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                14,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                18,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                6,221,551,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,470,046,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for retirement benefits | 
                                                112,034,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                91,764,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits for directors (and other officers) | 
                                                78,910,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                74,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                86,843,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                165,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Net assets | ||
| Share capital | 
                                                923,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                923,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | ||
| Capital surplus | 
                                                770,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                770,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                5,573,366,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,570,048,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -85,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                7,267,524,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,264,257,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                33,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,940,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                33,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,940,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                7,301,141,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,292,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                13,522,693,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,762,244,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |