Key Financial Data Of Group
| Concept | As at 2024-09-30 | 2024-04-01 to 2024-09-30 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-09-30 | 2023-04-01 to 2023-09-30 | 
|---|---|---|---|---|---|---|
| Key financial data of group | ||||||
| Business results of group | ||||||
| Net sales | — | 
                                                15,633,542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,273,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                11,633,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                1,454,663,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,346,984,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                831,794,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                986,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,591,060,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                555,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                939,399,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,724,758,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                615,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                18,367,577,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                17,778,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,852,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                29,221,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                33,218,092,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,330,008,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                107.69
                                                
                                             | 
                                                173.80
                                                
                                             | — | — | 
                                                60.70
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.629
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.535
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.640
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -2,153,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,976,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,137,322,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -570,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,091,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -652,217,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -545,932,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -486,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -149,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                5,207,748,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,433,138,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,376,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |