Treasury Shares, Etc.
| Concept | 
                                    
                                        As at 2024-11-30  | 
                            
                                
                                    
                                        As at 2024-11-30  | 
                            
                                
                                    
                                        As at 2024-11-30  | 
                            
                                
                                    
                                        As at 2024-11-30  | 
                            
                                
                                    
                                        As at 2024-11-30  | 
                            
                        
|---|---|---|---|---|---|
| Treasury shares, etc. | |||||
| Treasury shares, etc. | |||||
| Name of shareholder | — | 
                                        
                                             
                                                ビニフレーム工業株式会社
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                三協立山株式会社
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                協和紙工業株式会社
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                株式会社アイシン
                                                
                                             
                                        
                                     | 
                                
                            
| Address of shareholder | — | 
                                        
                                             
                                                富山県魚津市北鬼江616番地
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                富山県高岡市早川70番地
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                富山県射水市布目沢336-2
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                大阪府高槻市梶原中村町5-1
                                                
                                             
                                        
                                     | 
                                
                            
| Number of shares held in own name | 
                                        
                                             
                                                444,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                100,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                108,100
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                229,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                6,600
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Number of shares held in others' names | 
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Total number of shares held | 
                                        
                                             
                                                444,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                100,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                108,100
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                229,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                6,600
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Shareholding ratio | 
                                        
                                             
                                                0.0141
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0032
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0034
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0073
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0002
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     |