Employees
| Concept | 
                                    
                                        As at 2024-12-31  | 
                            
                                
                                    
                                        As at 2024-12-31  | 
                            
                        
|---|---|---|
| Employees | ||
| Metrics related to human capital diversity | ||
| Metrics of consolidated subsidiaries | ||
| Consolidated subsidiaries | 
                                        
                                             
                                                ㈱サンエー
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                クリヤマジャパン㈱
                                                
                                             
                                        
                                     | 
                                
                            
| Ratio of female employees in managerial positions | 
                                        
                                             
                                                0.040
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.063
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Ratio of male employees taking childcare leave | ||
| All employees | 
                                        
                                             
                                                0.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.300
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Differences in wages between male and female employees | ||
| All employees | 
                                        
                                             
                                                0.607
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.629
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Regular employees | 
                                        
                                             
                                                0.629
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.708
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Non-regular employees | 
                                        
                                             
                                                0.500
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.422
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     |