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 | — | 
                                                27,060,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,425,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                25,898,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                3,462,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,986,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,951,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                2,194,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,931,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,623,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                5,175,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,169,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                53,474,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                50,074,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,062,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                69,131,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                66,144,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,080,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                55.35
                                                
                                             | 
                                                122.13
                                                
                                             | — | — | 
                                                64.82
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.681
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.668
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.678
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                3,040,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,770,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,914,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -2,437,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,260,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                75,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -2,194,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,584,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,534,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                13,732,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                14,608,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,130,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |