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Earnings Per Equity Share - Additional Information (Detail) - shares
shares in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Employees Stock Option Scheme    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential equity shares excluded from the calculation of diluted earnings per share, average outstanding balance 0 0