Statement Of Changes In Equity
| Concept | 
                                    
                                        2023-04-21 to 2024-01-20  | 
                            
                                
                                    
                                        As at 2024-01-20  | 
                            
                                
                                    
                                        As at 2023-04-20  | 
                            
                                
                                    
                                        2022-04-21 to 2023-01-20  | 
                            
                        
|---|---|---|---|---|
| Statement of changes in equity | ||||
| Statement of changes in equity | ||||
| Net assets | — | 
                                        
                                             
                                                5,269,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                5,379,192,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
| Changes during period | ||||
| Profit (loss) | 
                                        
                                             
                                                -20,961,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | 
                                        
                                             
                                                -155,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     |