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 | — | 
                                                68,343,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                140,732,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                63,721,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                6,385,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,585,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,078,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                4,531,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,004,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,662,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                4,888,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,273,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,945,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                56,371,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                53,437,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,934,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                99,276,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                100,479,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                95,072,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                110.14
                                                
                                             | 
                                                170.36
                                                
                                             | — | — | 
                                                64.78
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.568
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.532
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.504
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                4,309,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,939,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                69,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -437,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -208,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -4,284,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,016,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,009,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                8,775,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,524,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,360,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |