Consolidated Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-09-30 | 
|---|---|---|
| Consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,297,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,756,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts receivable - other | 
                                                5,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts receivable - trade | 
                                                88,099,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                151,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                14,313,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                116,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Advance payments to suppliers | 
                                                454,535,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                392,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                579,513,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                437,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -1,990,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                6,011,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,071,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                1,732,156,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,474,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                398,024,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                408,075,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                269,701,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                279,561,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                128,423,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                128,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                361,092,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                37,116,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                194,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets, net | 
                                                14,147,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                144,954,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,843,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Own-used assets | ||
| Machinery, equipment and vehicles | — | — | 
| Machinery, equipment and vehicles, net | 
                                                1,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | — | — | 
| Other | — | — | 
| Intangible assets | ||
| Goodwill | 
                                                901,591,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                983,554,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other intangible assets | ||
| Other | 
                                                71,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                973,039,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,029,031,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Assets | 
                                                7,743,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,546,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                405,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                4,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                289,261,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current portion of long-term borrowings | 
                                                360,588,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                385,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses | 
                                                1,414,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                126,294,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                61,401,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,140,381,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,053,383,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                318,790,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,772,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,409,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits for directors (and other officers) | 
                                                7,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                18,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                411,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                90,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                29,736,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                1,552,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,144,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                6,110,510,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,323,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                6,633,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,633,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                4,652,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,652,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                -5,175,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,962,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -41,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -41,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                80,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,642,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                6,191,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,401,948,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                7,743,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,546,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity |