Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-03-31 | As at 2023-06-30 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,841,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,504,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                950,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                700,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                685,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                714,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                6,192,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,580,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                19,274,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,848,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                9,592,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,321,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | — | — | 
| Machinery, equipment and vehicles, net | 
                                                1,480,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,527,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                7,244,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,244,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | — | — | 
| Leased assets, net | 
                                                423,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                279,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                25,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                312,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                362,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                4,377,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,316,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Other | 
                                                1,820,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,751,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                23,965,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,527,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                30,157,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,107,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Income taxes payable | 
                                                174,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                96,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,554,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,171,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                9,059,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,356,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                5,735,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,592,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                912,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,011,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                3,166,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,159,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                603,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                460,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                10,568,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,376,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                19,628,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,733,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits for directors (and other officers) | 
                                                152,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                152,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                445,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                140,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                4,237,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,248,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                7,532,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,406,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,540,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,573,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                10,329,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,182,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                27,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Revaluation reserve for land | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                55,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                32,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                115,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                124,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                83,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                10,528,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,374,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                30,157,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,107,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |