Directors (And Other Officers)
| Concept | 
                                    
                                        As at 2025-06-25  | 
                            
                                
                                    
                                        As at 2025-06-25  | 
                            
                                
                                    
                                        As at 2025-06-25  | 
                            
                                
                                    
                                        As at 2025-06-25  | 
                            
                                
                                    
                                        As at 2025-06-25  | 
                            
                        
|---|---|---|---|---|---|
| Directors (and other officers) | |||||
| Information about directors (and corporate auditors) | |||||
| Official title or position | 
                                        
                                             
                                                代表取締役社長兼社長執行役員
                                                
                                             
                                        
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                                                取締役 (監査等委員)
                                                
                                             
                                        
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                                                取締役(監査等委員)
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                取締役(常勤監査等委員)
                                                
                                             
                                        
                                     | 
                                
                            
| Name | 
                                        
                                             
                                                田中 譲治
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                中川 洋
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                上野 博史
                                                
                                             
                                        
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                                    — | 
                                        
                                             
                                                吉川 昌利
                                                
                                             
                                        
                                     | 
                                
                            
| Date of birth | 
                                        
                                             
                                                1957-02-21
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1951-02-12
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1938-05-15
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                1979-01-14
                                                
                                             
                                        
                                     | 
                                
                            
| Career summary | — | ||||
| Term of office | 
                                        
                                             
                                                (注)2
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                (注)3
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                (注)3
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                (注)3
                                                
                                             
                                        
                                     | 
                                
                            
| Number of shares held (Ordinary shares) | 
                                        
                                             
                                                155,600
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                56,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                56,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                335,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                68,200
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     |