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 | — | 
                                                49,158,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                95,895,663,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                47,274,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                1,128,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,294,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,050,046,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                605,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,157,552,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                603,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                612,757,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,167,267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                613,164,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                16,096,923,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                16,132,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,035,749,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                49,353,209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                51,183,847,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,859,915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                58.31
                                                
                                             | 
                                                202.20
                                                
                                             | — | — | 
                                                55.44
                                                
                                             | 
| Equity-to-asset ratio | 
                                                0.326
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.315
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.296
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -951,502,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,621,942,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,456,351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -588,708,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,233,804,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -418,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                449,073,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,426,001,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                704,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                28,069,077,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                29,148,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,923,966,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |