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Employee Benefits - Summary of Change in Plan Assets (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure of net defined benefit liability (asset) [abstract]      
Current service cost ₨ 1,525 ₨ 1,130 ₨ 915
Net interest on net defined benefit liability/(asset) 7 (35) (30)
Net gratuity cost/(benefit) 1,532 1,095 885
Actual return on plan assets ₨ 501 ₨ 692 ₨ 351