Major Shareholders
| Concept | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|
| Major shareholders | |||||||||||
| Major shareholders | |||||||||||
| Name | 
                                                黄 俊利
                                                
                                             | 
                                                江川 麗子
                                                
                                             | 
                                                杉野 文俊
                                                
                                             | — | 
                                                鶴田 亮司
                                                
                                             | 
                                                江川 源
                                                
                                             | 
                                                河田 敏秀
                                                
                                             | 
                                                中原証券株式会社
                                                
                                             | 
                                                浅野 利広
                                                
                                             | 
                                                アクセスアジア株式会社
                                                
                                             | 
                                                楽天証券株式会社
                                                
                                             | 
| Address | 
                                                千葉県浦安市
                                                
                                             | 
                                                東京都品川区
                                                
                                             | 
                                                愛知県北名古屋市
                                                
                                             | — | 
                                                東京都大田区
                                                
                                             | 
                                                東京都品川区
                                                
                                             | 
                                                東京都文京区
                                                
                                             | 
                                                東京都中央区日本橋室町4丁目4-1
                                                
                                             | 
                                                山形県山形市
                                                
                                             | 
                                                東京都品川区大崎1丁目3-11
                                                
                                             | 
                                                東京都港区南青山2丁目6番21号
                                                
                                             | 
| Number of shares held | 
                                                2,863,600
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                3,026,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,106,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                57,360,200
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,200,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                3,300,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,564,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,050,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,581,700
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                34,059,400
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,609,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Shareholding ratio (excluding treasury shares) | 
                                                0.0168
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0177
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0123
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.3373
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0129
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0194
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0150
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0120
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0151
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.2002
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0153
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |