Semi-Annual Consolidated Statement Of Cash Flows
| Concept | 2023-10-01 to 2024-03-31 | As at 2024-03-31 | 2022-10-01 to 2023-09-30 | As at 2023-09-30 | 2021-10-01 to 2022-09-30 | As at 2022-09-30 | As at 2021-09-30 | 
|---|---|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                -435,524,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -742,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -838,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Depreciation | 
                                                4,494,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Impairment losses | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                89,826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in allowance for doubtful accounts | 
                                                -9,230,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,379,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest expenses | — | — | 
                                                1,958,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,864,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in trade receivables | 
                                                -36,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -112,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -38,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                2,519,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                39,905,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -41,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | 
                                                -436,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -482,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -740,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | 
                                                -3,407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -3,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                -445,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -488,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -749,956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -47,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -100,586,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | — | 
                                                -995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                -544,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                603,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -49,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -51,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -120,190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||||
| Proceeds from short-term borrowings | — | — | 
                                                50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of short-term borrowings | — | — | 
                                                -50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -50,837,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from long-term borrowings | 
                                                300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | 
                                                -13,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -67,454,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -27,828,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from issuance of shares | 
                                                159,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                134,808,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,006,265,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                446,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                117,847,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                973,141,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -49,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -421,503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                102,994,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                732,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                781,584,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,203,087,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,100,093,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |