Issued Shares
| Concept | 
                                    
                                        As at 2024-04-30  | 
                            
                                
                                    
                                        As at 2024-04-30  | 
                            
                                
                                    
                                        As at 2024-04-30  | 
                            
                                
                                    
                                        As at 2024-04-30  | 
                            
                                
                                    
                                        As at 2024-04-30  | 
                            
                                
                                    
                                        As at 2024-04-30  | 
                            
                                
                                    
                                        As at 2024-04-30  | 
                            
                        
|---|---|---|---|---|---|---|---|
| Issued shares | |||||||
| Issued shares | |||||||
| Number of shares | 
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                469,600
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1,987,900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                2,458,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Number of voting rights | — | 
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | — | 
                                        
                                             
                                                19,879
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                19,879
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Description | 
                                        
                                             | 
                                
                                    
                                        
                                             | 
                                
                                    
                                        
                                             | 
                                
                                    
                                        
                                             
                                                単元株式数100株
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             | 
                                
                                    
                                        
                                             
                                                同上
                                                
                                             
                                        
                                     | 
                                
                                    — |