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 | — | 
                                                5,968,230,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,248,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,994,293,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                -71,924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                323,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                227,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                -64,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                271,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                145,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                -34,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                233,006,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                85,979,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                5,961,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,153,927,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,011,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                14,473,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                15,204,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,210,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                -48.05
                                                
                                             | 
                                                199.84
                                                
                                             | — | — | 
                                                107.22
                                                
                                             | 
| Diluted earnings per share | — |  | 
                                                195.50
                                                
                                             | — | — | 
                                                105.57
                                                
                                             | 
| Equity-to-asset ratio | 
                                                0.347
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.342
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.334
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                814,873,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                386,892,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                177,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -162,050,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -680,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -140,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                120,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                269,956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                296,333,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                1,410,381,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                637,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                993,335,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |