Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-03-31 | As at 2023-09-30 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,552,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,070,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                29,991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                424,029,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                389,526,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                86,283,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                208,089,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                4,665,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,824,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                3,972,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,757,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | 
                                                2,247,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,065,180,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | 
                                                1,803,345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,790,986,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,793,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,684,288,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                259,215,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                323,432,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -3,044,649,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,984,147,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Goodwill | 
                                                100,003,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                63,823,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                113,079,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                125,803,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                213,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                189,626,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                611,587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                600,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Allowance for doubtful accounts | 
                                                -57,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -57,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                4,796,706,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,547,816,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred assets | 
                                                1,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred assets | ||
| Assets | 
                                                9,463,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,373,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                519,729,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                300,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                720,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                310,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                183,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                257,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                737,749,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                889,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                2,865,635,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,378,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Bonds payable | 
                                                86,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                115,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                1,150,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,080,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                54,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,804,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                98,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                98,152,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                100,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                104,990,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                1,490,539,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,456,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                4,356,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,835,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                131,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,901,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                984,597,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                762,266,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                895,708,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                673,377,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                3,138,567,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,002,038,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                5,018,872,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,437,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                21,642,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                21,642,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                66,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                80,140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                5,107,188,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,538,382,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                9,463,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,373,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |