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Earnings Per Equity Share - Additional Information (Detail)
12 Months Ended
Jun. 18, 2021
₨ / shares
Apr. 22, 2021
Aug. 02, 2019
₨ / shares
Mar. 31, 2022
₨ / shares
shares
Mar. 31, 2022
₨ / shares
$ / shares
shares
Mar. 31, 2021
₨ / shares
shares
Mar. 31, 2020
₨ / shares
shares
Sep. 20, 2019
₨ / shares
shares
Sep. 19, 2019
₨ / shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Equity shares, issued | shares       5,545,540,976 5,545,540,976 5,512,776,482   5,470,763,894  
Equity shares, par value       ₨ 1 ₨ 1 ₨ 1   ₨ 1 ₨ 2
Required transfer of after tax Indian GAAP profit to a non-distributable statutory reserve in order to pay dividends without prior RBI approval       25.00% 25.00%        
Dividends declared           6.5 ₨ 2.5    
Dividends declared per equity share | (per share) ₨ 6.5     ₨ 15.5 ₨ 0.2 ₨ 6.5 ₨ 2.5    
Special Interim Dividend                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Common Stock, Dividends, Per Share, Cash Paid     ₨ 2.5            
Maximum                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Equity shares, par value               ₨ 2  
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 | shares       19,064,987 19,064,987 73,917,840 24,224,032    
Indian GAAP [Member]                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Dividend payout, description of restrictions       As per the RBI guidelines, the dividend payout (excluding dividend tax) cannot exceed 35% of net income as calculated under Indian GAAP. As per the RBI guidelines, the dividend payout (excluding dividend tax) cannot exceed 35% of net income as calculated under Indian GAAP.        
Indian GAAP [Member] | Maximum                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Dividend payout, maximum pay out as a percentage of net income calculated under Indian GAAP   50.00%   35.00% 35.00%