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Employee Benefits - Summary of Change in Present Value of Defined Obligation (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation at the beginning of the year ₨ (1,042)    
Current service cost 1,782 ₨ 1,434 ₨ 1,525
Interest on obligation 63 25 7
Remeasurement loss/(gains)      
Actuarial loss arising from financial assumptions (749) (73) 296
Actuarial loss/(gain) arising from demographic assumptions (227) 40 54
Defined benefit obligation at the end of the year (2,930) (1,042)  
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 10,485 8,654  
Acquisitions 229 1,094  
Current service cost 1,782 1,434  
Interest on obligation 652 583  
Benefits paid (1,123) (1,047)  
Remeasurement loss/(gains)      
Actuarial loss arising from financial assumptions 749 73  
Actuarial loss/(gain) arising from demographic assumptions 227 (40)  
Actuarial loss/(gain) arising from experience adjustments 194 (266)  
Translation adjustment 270    
Defined benefit obligation at the end of the year ₨ 13,465 ₨ 10,485 ₨ 8,654