Shareholdings
| Concept | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | 
|---|---|---|---|---|---|---|
| Shareholdings | ||||||
| Reporting company | ||||||
| Details of specified investment shares held for purposes other than pure investment | ||||||
| Issue | 
                                                ㈱三菱UFJフィナンシャル・グループ
                                                
                                             | 
                                                ㈱中央倉庫
                                                
                                             | 
                                                ㈱三井住友フィナンシャルグループ(注3)
                                                
                                             | — | — | — | 
| Number of shares | 
                                                58,110
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                193,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                17,046
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                5,682
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                193,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                58,110
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                107,271,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                293,622,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,161,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,092,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                214,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Purpose of shareholding, overview of business alliance, quantitative effects of shareholding and reason for increase in number of shares | 
                                                営業上の取引関係の維持、強化を目的として保有しております。
                                                
                                             | 
                                                営業上の取引関係の維持、強化を目的として保有しております。
                                                
                                             | 
                                                営業上の取引関係の維持、強化を目的として保有しております。
                                                
                                             | — | — | — | 
| Whether issuer of aforementioned shares holds reporting company's shares | 
                                                無(注1)
                                                
                                             | 
                                                有
                                                
                                             | 
                                                無(注1)
                                                
                                             | — | — | — |