Shareholdings
| Concept | As at 2023-09-30 | As at 2023-09-30 | As at 2022-09-30 | As at 2022-09-30 | 
|---|---|---|---|---|
| Shareholdings | ||||
| Reporting company | ||||
| Details of specified investment shares held for purposes other than pure investment | ||||
| Issue | 
                                                ㈱三井住友フィナンシャルグループ
                                                
                                             | 
                                                ㈱コンコルディア・フィナンシャルグループ
                                                
                                             | — | — | 
| Number of shares | 
                                                1,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                20,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                20,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                13,224,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,630,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,940,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Whether issuer of aforementioned shares holds reporting company's shares | 
                                                無
(注)
                                                
                                             | 
                                                無
(注)
                                                
                                             | — | — |