Quarterly Balance Sheet
| Concept | As at 2024-03-31 | As at 2023-09-30 | 
|---|---|---|
| Quarterly balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,368,249,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,756,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                114,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                116,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                311,056,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                437,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -2,142,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                6,794,677,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,071,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                361,155,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                37,116,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Tools, furniture and fixtures | — | — | 
| Tools, furniture and fixtures, net | 
                                                6,329,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,224,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                194,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | — | — | 
| Leased assets, net | 
                                                12,827,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                539,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                891,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,029,031,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Goodwill | 
                                                819,378,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                983,554,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                71,792,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                394,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                408,075,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Deferred tax assets | 
                                                270,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                279,561,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                124,596,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                128,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                1,646,942,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,474,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                8,441,619,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,546,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                900,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                37,948,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                289,261,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                53,844,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                61,401,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,099,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,053,383,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                843,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,772,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                29,789,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                17,292,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                944,169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                90,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                2,043,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,144,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| 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 | 
                                                -4,890,277,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,962,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -43,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -41,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                6,395,938,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,323,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                2,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,642,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                6,398,256,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,401,948,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                8,441,619,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,546,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |