Shareholdings
| Concept | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|
| Shareholdings | ||||||
| Reporting company | ||||||
| Details of specified investment shares held for purposes other than pure investment | ||||||
| Issue | 
                                                株式会社神戸製鋼所
                                                
                                             | 
                                                伊藤忠商事株式会社
                                                
                                             | 
                                                株式会社京都フィナンシャルグループ
(注)2
                                                
                                             | — | — | — | 
| Number of shares | 
                                                165,154
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                782,752
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                322,736
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                832,752
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                165,154
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                80,684
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                339,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,061,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                891,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,581,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                173,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                504,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Purpose of shareholding, overview of business alliance, quantitative effects of shareholding and reason for increase in number of shares | 
                                                中長期的に良好な関係維持が当社の企業価値を向上させ、株式保有コストよりも経済的便益が大きい。
                                                
                                             | 
                                                中長期的に良好な関係維持が当社の企業価値を向上させ、株式保有コストよりも経済的便益が大きい。
                                                
                                             | 
                                                中長期的に良好な関係維持が当社の企業価値を向上させ、株式保有コストよりも経済的便益が大きい。
                                                
                                             | — | — | — | 
| Whether issuer of aforementioned shares holds reporting company's shares | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | — | — | — |