Major Shareholders
| Concept | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|
| Major shareholders | |||||||||||
| Major shareholders | |||||||||||
| Name | 
                                                楽天証券株式会社
                                                
                                             | 
                                                西本 誠治
                                                
                                             | 
                                                江川 源
                                                
                                             | 
                                                中原証券株式会社
                                                
                                             | 
                                                浅野 利広
                                                
                                             | 
                                                江川 麗子
                                                
                                             | 
                                                黄 俊利
                                                
                                             | — | 
                                                アクセスアジア株式会社
                                                
                                             | 
                                                河田 敏秀
                                                
                                             | 
                                                鶴田 亮司
                                                
                                             | 
| Address | 
                                                東京都港区南青山2丁目6-21
                                                
                                             | 
                                                福岡県小郡市
                                                
                                             | 
                                                東京都品川区
                                                
                                             | 
                                                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
                                                
                                             | 
                                                東京都中央区
                                                
                                             | — | 
                                                東京都品川区上大崎1丁目3-11
                                                
                                             | 
                                                東京都文京区
                                                
                                             | 
                                                東京都大田区
                                                
                                             | 
| Number of shares held | 
                                                2,766,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,650,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                3,253,100
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,050,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,696,100
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,026,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                3,600,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                57,865,400
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                34,059,400
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,564,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,200,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Shareholding ratio (excluding treasury shares) | 
                                                0.0162
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0155
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0191
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0120
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0158
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0119
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0211
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.3402
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.2002
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0150
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0129
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |