Quarterly Consolidated Balance Sheet
| Concept | As at 2023-09-30 | As at 2023-06-30 | 
|---|---|---|
| Quarterly consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                557,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                651,230,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                700,802,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                379,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                11,757,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,347,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -18,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -19,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                1,691,136,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,597,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                2,768,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,804,037,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                1,174,674,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,192,018,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | — | — | 
| Machinery, equipment and vehicles, net | 
                                                309,603,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                319,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,202,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,202,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | — | — | 
| Leased assets, net | 
                                                20,095,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,222,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                62,087,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,397,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Goodwill | 
                                                175,838,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                182,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                5,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                231,399,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                242,345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                624,774,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                599,783,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                74,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term loans receivable | 
                                                34,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                278,045,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                250,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                183,774,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                185,511,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -39,748,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -39,756,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                3,624,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,646,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                5,315,858,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,243,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                104,732,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                950,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                630,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                6,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,276,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                65,578,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                71,035,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,698,329,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,448,546,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Bonds payable | 
                                                108,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                108,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                769,793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                803,175,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                597,299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                602,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                14,407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,378,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                15,246,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,029,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                1,518,482,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,560,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                3,216,811,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,009,196,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                870,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                870,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                819,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                819,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                304,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                440,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                1,993,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,130,287,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                1,155,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                2,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                3,523,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                28,140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                73,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                72,754,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                2,099,046,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,234,272,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                5,315,858,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,243,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |