Shareholdings
| Concept | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 
|---|---|---|---|
| Shareholdings | |||
| Reporting company | |||
| Investment shares reclassified from held for purposes other than pure investment to held for pure investment | |||
| Issue | 
                                                小野薬品工業株式会社
                                                
                                             | 
                                                JCRファーマ株式会社
                                                
                                             | 
                                                CG Oncology,Inc.
                                                
                                             | 
| Number of shares | 
                                                2,010,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                4,918,700
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                3,543,533
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                3,221,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,380,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,976,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |