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 | — | 
                                                23,503,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                48,623,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                23,286,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                -7,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,709,382,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                680,624,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                -276,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,001,355,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                293,885,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                944,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,198,835,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                582,941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                10,659,939,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,813,485,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,254,154,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                37,539,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                36,092,535,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,732,519,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                -20.50
                                                
                                             | 
                                                74.30
                                                
                                             | — | — | 
                                                21.81
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.284
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.272
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.250
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                882,630,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,368,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -34,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -867,259,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -835,124,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -368,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                492,841,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,505,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -570,581,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                3,899,511,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,191,204,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,201,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |