Employees
| Concept | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2023-08-31 | As at 2023-08-31 | As at 2022-08-31 | As at 2022-08-31 | As at 2021-08-31 | As at 2021-08-31 | As at 2020-08-31 | As at 2020-08-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Employees | ||||||||||||||||||||||||
| Information about reporting company | ||||||||||||||||||||||||
| Information about employees of reporting company | ||||||||||||||||||||||||
| Number of employees | 
                                                1,460
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                879
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                25
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                24
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                109
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                109
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,012
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                818
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                44
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                25
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                603
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,594
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                818
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,696
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,100
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,328
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,953
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,279
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,638
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,579
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,968
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                1,065
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,008
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                12
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                12
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,029
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,005
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                59
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,086
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,005
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                997
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                942
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                924
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                970
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                805
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                762
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,782
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,744
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average age (Years) | — | — | — | — | — | — | 
                                                47.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Average length of service (Years) | — | — | — | — | — | — | 
                                                15.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Average annual salary | — | — | — | — | — | — | 
                                                4,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |