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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents for the Purpose of Cash Flow Statement (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
INR (₨)
Mar. 31, 2015
INR (₨)
Cash and cash equivalents [abstract]            
Cash and cash equivalents (as above) ₨ 44,925 $ 690 ₨ 52,710   ₨ 99,049  
Bank overdrafts (3,999)   (1,992)   (657)  
Total ₨ 40,926 $ 629 ₨ 50,718 $ 779 ₨ 98,392 ₨ 158,713