Major Shareholders
| Concept | 
                                    
                                        As at 2024-07-31  | 
                            
                                
                                    
                                        As at 2024-07-31  | 
                            
                                
                                    
                                        As at 2024-07-31  | 
                            
                                
                                    
                                        As at 2024-07-31  | 
                            
                                
                                    
                                        As at 2024-07-31  | 
                            
                                
                                    
                                        As at 2024-07-31  | 
                            
                                
                                    
                                        As at 2024-07-31  | 
                            
                                
                                    
                                        As at 2024-07-31  | 
                            
                                
                                    
                                        As at 2024-07-31  | 
                            
                                
                                    
                                        As at 2024-07-31  | 
                            
                                
                                    
                                        As at 2024-07-31  | 
                            
                        
|---|---|---|---|---|---|---|---|---|---|---|---|
| Major shareholders | |||||||||||
| Major shareholders | |||||||||||
| Name | 
                                        
                                             
                                                松藤展和
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                松藤真弓
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                松藤南輝
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                前山満
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                重村尚史
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                アクアプレコン株式会社
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                飯塚朋子
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                松藤花梨
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                千家道惠
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                小川由晃
                                                
                                             
                                        
                                     | 
                                
                            
| Address | 
                                        
                                             
                                                神奈川県川崎市高津区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                神奈川県川崎市高津区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                神奈川県川崎市高津区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                和歌山県和歌山市
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                東京都杉並区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                神奈川県川崎市高津区溝口1-15-3ブランズ溝の口レジデンス1201号
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                東京都葛飾区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                神奈川県川崎市高津区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                神奈川県横浜市緑区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                和歌山県和歌山市
                                                
                                             
                                        
                                     | 
                                
                            
| Number of shares held | 
                                        
                                             
                                                772,900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                60,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                60,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                21,100
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                30,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                150,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1,213,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                16,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                60,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                16,700
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                26,600
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Shareholding ratio (excluding treasury shares) | 
                                        
                                             
                                                0.5503
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0427
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0427
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0150
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0213
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.1068
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.8639
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0113
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0427
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0118
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0189
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     |