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 | — | 
                                                42,466,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                75,579,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                36,978,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                2,237,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,142,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,465,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                5,249,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,160,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,678,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                1,447,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,044,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,608,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                220,770,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                221,136,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                201,628,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                260,339,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                260,929,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                231,879,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                118.75
                                                
                                             | 
                                                246.61
                                                
                                             | — | — | 
                                                123.66
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.844
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.843
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.865
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                2,775,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,677,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -2,333,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                2,779,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,690,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,653,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -1,960,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,006,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -2,959,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                49,440,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                45,887,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,251,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |