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 | 
                                        
                                             
                                                UBS AG SINGAPORE
(常任代理人 シティバンク、エヌ・エイ東京支店)
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                SHOWA GROUP株式会社
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                湖中 博達
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                湖中 雄介
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                甲陽ハウジング有限会社
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                湖中 龍介
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                コナカ従業員持株会
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                湖中 謙介
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                寺田 和正
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                株式会社三井住友銀行
                                                
                                             
                                        
                                     | 
                                
                            
| Address | 
                                        
                                             
                                                AESCHENVORSTADT 1, CH-4002 BASEL SWITZERLAND
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                兵庫県加古川市平岡町新在家117
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                神奈川県鎌倉市
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                神奈川県横浜市泉区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                兵庫県西宮市甲陽園西山町2-22
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                神奈川県川崎市中原区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                神奈川県横浜市戸塚区品濃町517番地2
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                神奈川県鎌倉市
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                SINGAPORE
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                東京都千代田区丸の内1丁目1番2号
                                                
                                             
                                        
                                     | 
                                
                            
| Number of shares held | 
                                        
                                             
                                                953,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                783,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1,542,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                695,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                798,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                678,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1,789,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                11,044,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                2,289,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                758,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                754,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Shareholding ratio (excluding treasury shares) | 
                                        
                                             
                                                0.0283
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0233
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0458
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0207
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0237
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0201
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0532
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.3281
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0680
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0225
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0224
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     |