Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-03-31 | As at 2023-09-30 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,482,442,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,377,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                328,952,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                331,379,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -9,187,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                5,319,991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,845,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                13,424,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,522,509,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                1,710,201,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,804,297,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | — | — | 
| Machinery, equipment and vehicles, net | 
                                                7,715,416,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,063,665,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                3,708,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,629,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                241,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                49,343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Goodwill | 
                                                945,310,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                982,169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                360,955,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                379,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                1,306,266,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,361,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                1,673,290,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,678,804,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Non-current assets | 
                                                16,404,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,563,278,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                21,724,381,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,409,007,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                3,220,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,220,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                201,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                267,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                715,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                653,393,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                6,924,118,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,895,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Bonds payable | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                9,713,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,433,769,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                173,068,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                163,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                297,371,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                296,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                42,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                10,313,621,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,238,484,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                17,237,739,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,134,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits for directors (and other officers) | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                193,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                129,530,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                146,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                87,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                74,104,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                747,419,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                747,419,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                684,918,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                684,918,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                3,199,921,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,035,781,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -748,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -768,713,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                3,884,024,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,699,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                546,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                511,752,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred gains or losses on hedges | 
                                                8,070,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,008,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                554,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                524,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                20,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                27,772,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                4,486,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,274,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                21,724,381,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,409,007,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |