Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-12-31 | As at 2024-06-30 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,264,586,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,116,895,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                528,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                374,754,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                21,013,570,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,074,259,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                1,921,283,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,959,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Intangible assets | ||
| Intangible assets | 
                                                608,186,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                676,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                5,145,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,335,031,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                618,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                747,506,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                91,432,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                72,935,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                928,254,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,059,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                7,675,168,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,970,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                28,688,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,045,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit asset | 
                                                3,507,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,455,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                7,200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                905,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                374,542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                900,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,866,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,785,499,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                13,020,726,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,150,161,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                629,069,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                850,956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                166,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                154,305,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                97,092,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                122,941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                256,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                272,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                2,137,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,408,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                15,158,168,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,558,594,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits for directors (and other officers) | 
                                                152,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                75,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                16,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                988,785,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,007,843,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Share capital | 
                                                2,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | 
                                                1,696,099,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,609,136,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                8,903,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,821,221,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -22,836,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -28,545,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                12,576,950,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,401,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                257,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                352,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                -16,177,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -15,443,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                700,778,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                731,231,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                942,380,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,067,994,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                11,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,654,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                13,530,570,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,486,462,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                28,688,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,045,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |