Quarterly Consolidated Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-09-30 | 
|---|---|---|
| Quarterly consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,455,322,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,479,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                307,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                272,424,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                168,812,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                203,623,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                2,584,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,344,935,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                1,487,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,496,263,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | 
                                                1,745,490,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,734,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -1,275,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,256,971,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings and structures, net | 
                                                469,802,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                477,134,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | 
                                                79,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,365,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -47,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -46,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles, net | 
                                                32,037,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                883,878,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                883,878,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                64,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                82,849,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                41,879,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                689,155,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                692,159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Deferred tax assets | 
                                                41,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,908,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                161,244,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                169,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -87,254,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -94,263,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                2,219,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,233,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred assets | 
                                                9,789,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,573,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred assets | ||
| Business commencement expenses | 
                                                9,789,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,573,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                4,813,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,582,566,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                37,999,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                6,485,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                184,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                230,584,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,408,309,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,247,821,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                1,411,633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,507,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                214,577,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                220,936,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                21,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                1,647,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,749,952,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                3,055,519,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,997,773,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                530,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                530,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                438,187,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                438,187,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                748,289,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                563,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -17,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -17,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                1,699,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,514,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Foreign currency translation adjustment | 
                                                4,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,706,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                4,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,706,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                54,669,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                1,758,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,584,792,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                4,813,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,582,566,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |