Shareholdings
| Concept | 
                                    
                                        As at 2025-03-31  | 
                            
                                
                                    
                                        As at 2024-03-31  | 
                            
                        
|---|---|---|
| Shareholdings | ||
| Reporting company | ||
| Details of specified investment shares held for purposes other than pure investment | ||
| Issue | 
                                        
                                             
                                                ㈱ジャックス
                                                
                                             
                                        
                                     | 
                                
                                    — | 
| Number of shares | 
                                        
                                             
                                                48,568
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                45,765
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Carrying amount | 
                                        
                                             
                                                189,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                255,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Purpose of shareholding, overview of business alliance, quantitative effects of shareholding and reason for increase in number of shares | 
                                        
                                             
                                                (保有目的)
 当社顧客が利用する住宅ローンの提携先として取引があり、良好な関係・提携強化のため保有しています。
(定量的な保有効果)(注)
(株式数が増加した理由)
 取引先持株会を通じた株式の取得により、株式数が増加しております。
                                                
                                             
                                        
                                     | 
                                
                                    — | 
| Whether issuer of aforementioned shares holds reporting company's shares | 
                                        
                                             
                                                無
                                                
                                             
                                        
                                     | 
                                
                                    — |