Shareholdings
| Concept | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Shareholdings | ||||||||||||||||||||||||||||||||||||||||||||||||
| Reporting company | ||||||||||||||||||||||||||||||||||||||||||||||||
| Details of specified investment shares held for purposes other than pure investment | ||||||||||||||||||||||||||||||||||||||||||||||||
| Issue | 
                                                川田テクノロジーズ㈱
                                                
                                             | 
                                                応用地質㈱
                                                
                                             | 
                                                UBE㈱
                                                
                                             | 
                                                ライト工業㈱
                                                
                                             | 
                                                DNホールディングス㈱
                                                
                                             | 
                                                コムシスホールディングス㈱
                                                
                                             | 
                                                いであ㈱
                                                
                                             | 
                                                ㈱ウエスコホールディングス
                                                
                                             | 
                                                日本基礎技術㈱
                                                
                                             | 
                                                E・Jホールディングス㈱
                                                
                                             | 
                                                前澤化成工業㈱
                                                
                                             | 
                                                ㈱オオバ
                                                
                                             | 
                                                アジア航測㈱
                                                
                                             | 
                                                ㈱オリエンタルコンサルタンツホールディングス
                                                
                                             | 
                                                ㈱NJS
                                                
                                             | 
                                                人・夢・技術グループ㈱
                                                
                                             | 
                                                ㈱FCホールディングス
                                                
                                             | 
                                                ㈱横河ブリッジホールディングス
                                                
                                             | 
                                                第一生命ホールディングス㈱
                                                
                                             | 
                                                川崎地質㈱
                                                
                                             | 
                                                ショーボンドホールディングス㈱
                                                
                                             | 
                                                ㈱内田洋行
                                                
                                             | 
                                                ㈱三菱UFJフィナンシャル・グループ
                                                
                                             | 
                                                ㈱千葉銀行
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Number of shares | 
                                                12,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                98,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                19,040
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                265,100
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                100,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                81,900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                180,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                23,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                120,680
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                36,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                186,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                102,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                57,200
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                50,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                105,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                54,917
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                21,700
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,600
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                9,400
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                47,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                145,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                30,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                9,400
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                81,900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                186,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                102,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                145,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                12,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                19,040
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                265,100
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                57,200
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                15,392
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                50,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                134,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                3,200
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                120,680
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                105,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                21,700
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                49,925
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,600
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                47,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                30,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                98,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                180,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                100,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                36,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                78,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                202,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                501,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                141,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                142,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                91,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                195,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                170,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                98,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                155,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                136,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                181,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                55,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                294,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                175,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                139,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                121,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                128,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                501,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                153,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                101,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                160,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                186,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                264,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                224,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                81,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                126,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Whether issuer of aforementioned shares holds reporting company's shares | 
                                                有 (注2)
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有 (注2)
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有 (注2)
                                                
                                             |  | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有 (注2)
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有 (注2)
                                                
                                             | 
                                                有
                                                
                                             | 
                                                有 (注2)
                                                
                                             |  | 
                                                有(注2)
                                                
                                             | 
                                                有 (注2)
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |