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Employee Benefits - Summary of Change in Present Value of Defined Obligation (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at the beginning of the year ₨ (351)    
Current service cost 1,525 ₨ 1,130 ₨ 915
Interest on obligation 7 (35) (30)
Remeasurement loss/(gains)      
Actuarial loss/(gain) arising from financial assumptions 296 (363) (180)
Actuarial loss/(gain) arising from demographic assumptions 54 73 (2)
Defined benefit obligation at the end of the year (147) (351)  
Present value of defined benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at the beginning of the year 8,270 6,656  
Acquisitions 38 751  
Current service cost 1,525 1,130  
Interest on obligation 490 464  
Benefits paid (865) (708)  
Remeasurement loss/(gains)      
Actuarial loss/(gain) arising from financial assumptions (296) 363  
Actuarial loss/(gain) arising from demographic assumptions (54) (73)  
Actuarial loss/(gain) arising from experience adjustments (454) (313)  
Defined benefit obligation at the end of the year ₨ 8,654 ₨ 8,270 ₨ 6,656