Key Financial Data Of Group
| Concept | As at 2023-10-31 | 2023-08-01 to 2023-10-31 | 2023-05-01 to 2023-10-31 | 2022-05-01 to 2023-04-30 | As at 2023-04-30 | 2022-08-01 to 2022-10-31 | As at 2022-10-31 | 2022-05-01 to 2022-10-31 | 
|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||
| Business results of group | ||||||||
| Net sales | — | — | 
                                                5,872,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,213,880,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                6,425,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | — | 
                                                717,073,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,102,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                416,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | — | 
                                                1,143,221,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,092,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                208,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | — | 
                                                514,244,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,258,489,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                280,087,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                14,862,154,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                14,456,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                13,478,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                17,333,542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                17,139,298,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                16,406,919,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                161.77
                                                
                                             | 
                                                842.08
                                                
                                             | 
                                                804.45
                                                
                                             | — | 
                                                -12.32
                                                
                                             | — | 
                                                153.51
                                                
                                             | 
| Diluted earnings per share | — | — |  |  | — | — | — |  | 
| Equity-to-asset ratio | 
                                                0.857
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.843
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.822
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                962,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,089,934,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                700,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -2,121,522,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                422,856,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                11,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -160,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -266,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -213,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                4,956,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                6,292,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,589,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |