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Property, Plant and Equipment - Additional Information (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of detailed information about property, plant and equipment [abstract]    
Interest capitalized ₨ 157 ₨ 89
Capitalization rate of borrowing cost 1.90% 2.40%