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 | — | 
                                                42,633,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                95,205,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                34,588,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                4,226,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,627,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,048,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                2,554,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,011,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                893,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                4,619,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,717,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,436,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                95,365,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                91,583,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                85,843,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                136,749,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                139,695,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                129,214,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                58.48
                                                
                                             | 
                                                137.09
                                                
                                             | — | — | 
                                                20.38
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.689
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.648
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.657
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                1,554,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,172,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,176,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -1,418,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,479,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -2,443,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -1,716,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,485,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                322,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                24,020,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                25,910,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,698,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |