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Consolidated Statement of Changes in Equity (Parenthetical) - shares
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Statement [LineItems]      
Shares transferred for exercise option 4,607,772 2,599,183 4,351,775
Treasury shares [member]      
Statement [LineItems]      
Treasury shares held 22,746,081 27,353,853 23,097,216