Employees
| Concept | As at 2023-10-31 | As at 2023-10-31 | As at 2023-10-31 | As at 2023-10-31 | As at 2023-10-31 | As at 2022-10-31 | As at 2022-10-31 | As at 2021-10-31 | As at 2021-10-31 | As at 2020-10-31 | As at 2020-10-31 | As at 2019-10-31 | As at 2019-10-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Employees | |||||||||||||
| Information about reporting company | |||||||||||||
| Information about employees of reporting company | |||||||||||||
| Number of employees | 
                                                2,680
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,732
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                289
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                659
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,732
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,329
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,617
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,530
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,185
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,401
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,090
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,261
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,882
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                19,185
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                15,707
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,725
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,753
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                15,707
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                18,250
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                15,358
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14,124
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                16,330
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                13,064
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14,205
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                12,536
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                13,873
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average age (Years) | — | 
                                                31.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Average length of service (Years) | — | 
                                                6.8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Average annual salary | — | 
                                                4,604,330
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — |