Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                16,888,452,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,358,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -12,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -13,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,256,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,699,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                27,188,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,702,869,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                29,045,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,043,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | 
                                                22,154,286,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,480,977,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                14,071,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,849,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets, net | 
                                                152,351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                159,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                43,197,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,034,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                796,254,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                820,771,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Intangible assets | 
                                                76,535,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                83,237,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                76,535,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                83,237,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                6,814,380,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,479,370,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investment securities | 
                                                5,281,587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,510,176,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments in capital | 
                                                1,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term loans receivable | 
                                                333,518,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                340,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                609,264,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,038,153,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -28,195,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -29,523,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                616,446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                618,565,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Own-used assets | ||
| Leased assets | — | — | 
| Intangible assets | ||
| Other intangible assets | ||
| Investments and other assets | ||
| Other assets | ||
| Assets | 
                                                56,233,658,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,746,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                591,586,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - trade | 
                                                4,013,907,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,374,720,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current portion of long-term borrowings | 
                                                18,781,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,811,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                265,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                230,095,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                62,560,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,254,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,764,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,636,878,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                7,251,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,541,478,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                535,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                958,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Non-current liabilities | ||
| Non-current liabilities | 
                                                5,015,819,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,761,135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                156,560,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                160,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                345,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                142,662,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                573,142,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                634,124,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                196,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                193,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                12,267,733,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,302,614,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                39,308,974,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,345,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                2,046,941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,046,941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,478,058,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,464,060,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                37,418,253,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,053,092,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,634,278,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,218,638,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                3,058,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,635,851,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                1,894,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,422,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                43,965,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,443,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                56,233,658,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,746,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Valuation and translation adjustments | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings |