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 | — | 
                                                1,822,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,452,186,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,756,494,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                108,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,576,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                12,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                106,141,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                127,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                10,772,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                106,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                127,035,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                10,835,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                948,642,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                853,697,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                595,355,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                2,123,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,378,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,319,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                74.12
                                                
                                             | 
                                                94.84
                                                
                                             | — | — | 
                                                8.48
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.447
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.359
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.256
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                151,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                244,637,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                337,343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -11,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,769,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                126,881,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -219,355,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -50,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                32,074,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                1,104,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,183,893,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,463,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |