XML 158 R146.htm IDEA: XBRL DOCUMENT v3.19.2
Employee Benefits - Summary of Change in Plan Assets (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of net defined benefit liability (asset) [abstract]      
Current service cost ₨ 1,434 ₨ 1,525 ₨ 1,130
Net interest on net defined benefit liability/(asset) 25 7 (35)
Net gratuity cost/(benefit) 1,459 1,532 1,095
Actual return on plan assets ₨ 607 ₨ 501 ₨ 692