Shareholdings
| Concept | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Shareholdings | ||||||||||||||||||
| Largest holding company | ||||||||||||||||||
| Details of deemed holdings of shares held for purposes other than pure investment | ||||||||||||||||||
| Issue | 
                                                三菱電機株式会社
                                                
                                             | 
                                                DOWAホールディングス株式会社
                                                
                                             | 
                                                京王電鉄株式会社
                                                
                                             | 
                                                信越化学工業株式会社
                                                
                                             | 
                                                株式会社ニコン
                                                
                                             | 
                                                三菱地所株式会社
                                                
                                             | 
                                                花王株式会社
                                                
                                             | 
                                                株式会社セブン&アイ・ホールディングス
                                                
                                             | 
                                                株式会社日立製作所
                                                
                                             | — | — | — | — | — | — | — | — | — | 
| Number of shares | 
                                                1,000,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                324,030
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                210,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                4,200,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,085,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                300,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                482,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                537,120
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,085,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                300,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                537,120
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                840,100
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                482,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                220,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                210,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,000,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                324,030
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                1,578,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,375,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                979,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,957,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,470,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                472,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,490,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,209,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,425,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                545,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,122,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,785,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,422,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,356,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,008,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,410,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,817,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Whether issuer of aforementioned shares holds reporting company's shares | 
                                                無
                                                
                                             | 
                                                有
                                                
                                             | 
                                                無
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | 
                                                無
                                                
                                             | — | — | — | — | — | — | — | — | — |