Shareholdings
| Concept | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 
|---|---|---|---|---|---|---|
| Shareholdings | ||||||
| Largest holding company | ||||||
| Details of deemed holdings of shares held for purposes other than pure investment | ||||||
| Issue | 
                                                トヨタ自動車株式会社
                                                
                                             | 
                                                三菱電機株式会社
                                                
                                             | 
                                                オリックス株式会社
                                                
                                             | — | — | — | 
| Number of shares | 
                                                1,327,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                630,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                205,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                410,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,655,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,260,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                3,472,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,713,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                632,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,352,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,067,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,165,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Purpose of shareholding, overview of business alliance, quantitative effects of shareholding and reason for increase in number of shares | 
                                                退職給付信託へ拠出のうえ保有しており、議決権行使の指図権限を有しております。
                                                
                                             | 
                                                退職給付信託へ拠出のうえ保有しており、議決権行使の指図権限を有しております。
                                                
                                             | 
                                                退職給付信託へ拠出のうえ保有しており、議決権行使の指図権限を有しております。
                                                
                                             | — | — | — | 
| Whether issuer of aforementioned shares holds reporting company's shares | 
                                                無
                                                
                                             | 
                                                無
                                                
                                             | 
                                                無
                                                
                                             | — | — | — |