Treasury Shares, Etc.
| Concept | 
                                    
                                        As at 2024-06-30  | 
                            
                                
                                    
                                        As at 2024-06-30  | 
                            
                        
|---|---|---|
| Treasury shares, etc. | ||
| Treasury shares, etc. | ||
| Name of shareholder | 
                                        
                                             
                                                立川ブラインド工業株式会社
                                                
                                             
                                        
                                     | 
                                
                                    — | 
| Address of shareholder | 
                                        
                                             
                                                東京都港区三田3丁目1-12
                                                
                                             
                                        
                                     | 
                                
                                    — | 
| Number of shares held in own name | 
                                        
                                             
                                                2,300,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                2,300,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Number of shares held in others' names | 
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Total number of shares held | 
                                        
                                             
                                                2,300,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                2,300,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Shareholding ratio | 
                                        
                                             
                                                0.1108
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.1108
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     |