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 | — | 
                                                100,994,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                192,992,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                93,060,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                3,047,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,318,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,123,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                2,040,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,175,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,253,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                2,184,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,951,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,082,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                30,645,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                29,973,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,985,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                66,961,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                61,872,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                58,457,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                46.44
                                                
                                             | 
                                                117.46
                                                
                                             | — | — | 
                                                51.14
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.458
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.484
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.479
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                1,902,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,392,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -6,183,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,002,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,723,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                3,435,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,944,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -920,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                16,291,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                17,133,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,443,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |