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 | — | 
                                                159,910,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                363,366,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                164,370,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                11,134,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,150,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,256,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                8,192,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,612,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,021,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                8,067,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,212,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                10,703,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                169,185,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                167,231,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                151,681,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                301,254,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                340,106,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                304,416,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                123.39
                                                
                                             | 
                                                295.68
                                                
                                             | — | — | 
                                                90.82
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.551
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.483
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.488
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                21,159,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -13,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -12,292,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -2,629,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -8,103,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -8,078,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -23,247,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -491,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -7,876,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                44,939,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                49,064,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,523,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |