Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                3,217,940,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,062,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                773,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                567,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -8,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -7,754,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                10,206,250,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,737,584,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                10,918,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,132,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                2,765,746,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,144,322,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | — | — | 
| Machinery, equipment and vehicles, net | 
                                                1,562,614,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,528,732,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                3,944,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,944,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                2,645,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,514,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Goodwill | 
                                                1,087,268,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                421,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                168,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                182,128,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                1,255,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                603,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                4,503,032,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,062,063,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                1,178,327,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,211,873,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                779,992,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                586,159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -45,397,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -43,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                16,676,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,797,728,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                26,883,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,535,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                2,645,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,030,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                493,185,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                533,103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,864,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,843,850,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                8,318,288,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,517,050,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                3,654,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,663,817,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                154,261,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                152,731,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                416,262,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                330,343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,779,617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,559,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                6,004,531,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,706,374,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                14,322,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,223,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                377,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                359,297,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                1,001,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,001,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                177,259,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                140,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                11,066,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,850,916,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -18,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -43,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                12,226,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,949,403,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                357,482,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                390,403,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                -23,982,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -27,919,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                333,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                362,484,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                12,560,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,311,887,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                26,883,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,535,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |