Semi-Annual Consolidated Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-09-30 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,936,793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,070,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                29,994,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                418,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                389,526,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                99,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                208,089,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                3,713,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,824,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                3,966,295,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,757,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | 
                                                2,226,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,065,180,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | 
                                                1,806,908,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,790,986,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,773,338,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,684,288,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                251,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                323,432,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -3,006,308,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,984,147,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                174,049,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                189,626,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                586,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                600,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Allowance for doubtful accounts | 
                                                -57,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -57,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                4,727,258,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,547,816,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred assets | 
                                                1,348,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred assets | ||
| Assets | 
                                                8,441,944,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,373,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                348,993,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                300,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                755,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                310,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                54,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                257,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                834,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                889,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                2,569,851,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,378,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Bonds payable | 
                                                115,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                115,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                984,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,080,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                54,973,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,804,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                98,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                98,152,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                112,534,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                104,990,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                1,365,168,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,456,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                3,935,019,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,835,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                60,557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,901,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                762,266,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                762,266,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                673,377,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                673,377,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                2,992,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,002,038,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                4,427,804,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,437,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                13,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                13,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                1,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                64,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                80,140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                4,506,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,538,382,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                8,441,944,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,373,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |