Shareholdings
| Concept | As at 2023-12-31 | As at 2022-12-31 | 
|---|---|---|
| Shareholdings | ||
| Reporting company | ||
| Details of specified investment shares held for purposes other than pure investment | ||
| Issue | 
                                                株式会社壽屋
                                                
                                             | — | 
| Number of shares | 
                                                24,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                30,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                38,736,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                327,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Whether issuer of aforementioned shares holds reporting company's shares | 
                                                無
                                                
                                             | — |