| 12/04/2020 | 
                                    
                                    Consolidated Financial Results for the 2nd Quarter of the Fiscal Year Ending March 31, 2021(IFRS) | 
                                    
                                
                                
                                
                                    | 11/11/2020 | 
                                    
                                    FY2021/3 H1, Presentation (Apr.1 to Sep.30 2020) | 
                                    
                                
                                
                                
                                    | 11/11/2020 | 
                                    
                                    FY2021/3 H1, Supplementary Material(Apr.1 to Sep.30 2020) | 
                                    
                                
                                
                                
                                    | 09/04/2020 | 
                                    
                                    Consolidated Financial Results for the 1st Quarter of the Fiscal Year Ending March 31, 2021(IFRS) | 
                                    
                                
                                
                                
                                    | 08/11/2020 | 
                                    
                                    Year Ending March 31, 2021 Results of 1st Quarter Settlement of Accounts Supplementary Material (Apr.1 to Jun.30 2020) | 
                                    
                                
                                
                                
                                    | 07/30/2020 | 
                                    
                                    Notice on Acquisition of A Company to be Established to Take Over Generic Pharmaceutical Business from Teva Takeda Pharma Ltd. | 
                                    
                                
                                
                                
                                    | 07/30/2020 | 
                                    
                                    Presentation Materials of Acquisition of Generic Pharmaceutical Business from Teva Takeda Pharma Ltd.  | 
                                    
                                
                                
                                
                                    | 06/22/2020 | 
                                    
                                    Consolidated Financial Results for the Fiscal Year Ended March 31, 2020 (IFRS) | 
                                    
                                
                                
                                
                                    | 06/08/2020 | 
                                    
                                    The University of Tokyo, RIKEN, Nichi-Iko and Daiichi Sankyo Reach Basic Agreement on Collaborative R&D on Nafamostat Inhalation Formulation for Treatment of Novel Corona Virus Infection (COVID-19) | 
                                    
                                
                                
                                
                                    | 06/01/2020 | 
                                    
                                    Notice of the 56th Ordinary General Meeting of Shareholders | 
                                    
                                
                                
                                
                                    | 05/18/2020 | 
                                    
                                    Year Ended March 31, 2020 Results  Settlement of Accounts Supplementary Material (Apr.1 2019 to Mar.31 2020) | 
                                    
                                
                                
                                
                                    | 05/18/2020 | 
                                    
                                    F2019, ended March 2020 | 
                                    
                                
                                
                                
                                    | 03/13/2020 | 
                                    
                                    Consolidated Financial Results for the Third Quarter of the Fiscal Year Ending March 31, 2020 (IFRS) | 
                                    
                                
                                
                                
                                    | 02/14/2020 | 
                                    
                                    FY2020/3 Q3, Supplementary Material(Apr.1 to Dec.31 2019)  |