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Business Combination - Additional Information (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2018
INR (₨)
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Disclosure of detailed information about business combination [line items]        
Total consideration   ₨ 10,433    
Goodwill ₨ 117,584 131,012 $ 1,738 ₨ 116,980
Material acquisitions [member]        
Disclosure of detailed information about business combination [line items]        
Acquisition date Mar. 31, 2018      
Total consideration ₨ 6,924 10,433    
Cash and cash equivalents acquired 58 317    
Trade receivables acquired 215 831    
Goodwill ₨ 1,185 ₨ 4,833