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Employee Benefits - Summary of Change in Present Value of Defined Obligation (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at the beginning of the year ₨ (147)    
Current service cost 1,434 ₨ 1,525 ₨ 1,130
Interest on obligation 25 7 (35)
Remeasurement loss/(gains)      
Actuarial loss/(gain) arising from financial assumptions (73) 296 (363)
Actuarial loss/(gain) arising from demographic assumptions 40 54 73
Defined benefit obligation at the end of the year (1,042) (147)  
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 8,654 8,270  
Acquisitions (Note 32) 1,094 38  
Current service cost 1,434 1,525  
Interest on obligation 583 490  
Benefits paid (1,047) (865)  
Remeasurement loss/(gains)      
Actuarial loss/(gain) arising from financial assumptions 73 (296)  
Actuarial loss/(gain) arising from demographic assumptions (40) (54)  
Actuarial loss/(gain) arising from experience adjustments (266) (454)  
Defined benefit obligation at the end of the year ₨ 10,485 ₨ 8,654 ₨ 8,270