Consolidated Statement Of Cash Flows
| Concept | 2024-04-01 to 2024-09-30 | As at 2024-09-30 | As at 2024-03-31 | 2023-04-01 to 2023-09-30 | As at 2023-09-30 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|
| Consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Subtotal | 
                                                -1,064,391,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -616,554,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                -1,066,826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -619,048,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                918,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | ||||||
| Net cash provided by (used in) financing activities | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                211,138,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                -1,112,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -1,067,939,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -407,529,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                349,122,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,417,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                436,811,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                844,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |