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 | — | 
                                                77,610,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                138,253,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                63,525,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                6,235,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,460,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,540,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                3,839,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,253,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,123,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                3,659,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,380,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,501,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                63,346,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                61,007,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                207,128,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                202,606,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                179,396,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                160.42
                                                
                                             | 
                                                509.46
                                                
                                             | — | — | 
                                                129.87
                                                
                                             | 
| Diluted earnings per share | — | 
                                                159.69
                                                
                                             | 
                                                507.56
                                                
                                             | — | — | 
                                                129.51
                                                
                                             | 
| Equity-to-asset ratio | 
                                                0.303
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.298
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.286
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                4,726,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,266,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,067,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -944,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -16,541,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -960,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                4,318,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,636,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,239,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                16,565,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,374,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,344,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |