Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                26,808,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,224,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -20,267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -25,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                44,162,909,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,405,803,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                3,320,242,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,203,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                70,689,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                72,233,038,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                28,327,207,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,193,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets, net | 
                                                374,278,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                413,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                18,879,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                108,214,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                711,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                786,258,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,677,956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,529,669,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -1,966,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,743,411,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Own-used assets | ||
| Leased assets | 
                                                963,819,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,062,117,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -589,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -648,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                550,254,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                474,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Software | 
                                                109,874,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                139,982,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                34,631,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,988,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | 
                                                2,278,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other intangible assets | ||
| Investments and other assets | ||
| Investment securities | 
                                                26,228,452,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,854,263,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                30,047,078,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,861,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term loans receivable | 
                                                569,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                590,610,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                575,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                787,542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -194,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -194,884,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,694,056,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,666,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                101,286,515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                98,569,207,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Other assets | ||
| Assets | 
                                                145,449,424,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                138,975,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Non-current liabilities | ||
| Non-current liabilities | 
                                                16,066,241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,187,629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                5,188,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,603,552,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                3,095,183,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,724,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                912,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                763,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                636,294,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                703,912,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                2,055,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,038,138,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits for directors (and other officers) | 
                                                3,874,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,953,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                11,972,385,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,852,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - trade | 
                                                4,870,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,750,701,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                1,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                653,702,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                435,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                3,413,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,187,923,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | ||
| Lease liabilities | 
                                                436,677,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                836,449,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current portion of long-term borrowings | 
                                                564,756,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                589,756,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses | 
                                                879,232,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,752,078,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                28,038,627,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,039,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                98,490,196,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                95,269,669,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                2,350,704,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,350,704,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,597,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,597,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                96,770,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                93,626,812,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -2,228,515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,304,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                14,104,921,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,270,399,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                11,246,366,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,346,825,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                117,410,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                108,935,110,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                145,449,424,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                138,975,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Valuation and translation adjustments | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings |