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Segment Information - Summary of Information on Reportable Segments (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Disclosure of operating segments [line items]        
Revenue ₨ 610,232 $ 8,094 ₨ 585,845 ₨ 544,871
Segment Result Total 105,730 1,402 99,910 84,294
Finance expense (7,328) (97) (7,375) (5,830)
Finance and other income 24,081 319 22,923 23,999
Share of profit/ (loss) of associates accounted for using the equity method 29 [1] (43) 11
Profit before tax 122,512 1,624 115,415 102,474
Income tax expense (24,799) (329) (25,242) (22,390)
Profit for the year 97,713 $ 1,295 90,173 80,084
Depreciation, amortization and impairment 20,862   19,474 21,124
Operating Segments [member]        
Disclosure of operating segments [line items]        
Revenue 613,401   589,060 546,359
Other operating income 1,144   4,344  
Segment Result 102,009   92,424 80,947
Unallocated 2,577   3,142 3,347
Operating Segments [member] | Information Technology Services [member]        
Disclosure of operating segments [line items]        
Revenue 594,041   568,253 517,716
Other operating income 1,144   4,344 0
Segment Result 103,964   95,017 79,812
Unallocated 2,577   3,142 3,347
Segment Result Total 107,685   102,503 83,159
Operating Segments [member] | Information Technology Services [member] | Banking Financial Services and Insurance (BFSI) [member]        
Disclosure of operating segments [line items]        
Revenue 184,457   175,262 144,139
Segment Result 34,132   33,831 24,549
Operating Segments [member] | Information Technology Services [member] | Health Business unit [member]        
Disclosure of operating segments [line items]        
Revenue 78,240   75,081 74,136
Segment Result 12,027   8,638 9,624
Operating Segments [member] | Information Technology Services [member] | Consumer Business Unit (CBU) [member]        
Disclosure of operating segments [line items]        
Revenue 97,008   89,313 77,914
Segment Result 16,729   16,828 12,619
Operating Segments [member] | Information Technology Services [member] | Energy, Natural Resources and Utilities (ENU) [member]        
Disclosure of operating segments [line items]        
Revenue 76,443   72,830 67,841
Segment Result 12,176   7,081 8,097
Operating Segments [member] | Information Technology Services [member] | Technology [member]        
Disclosure of operating segments [line items]        
Revenue 75,895   76,591 73,947
Segment Result 14,312   15,916 14,680
Operating Segments [member] | Information Technology Services [member] | Manufacturing [member]        
Disclosure of operating segments [line items]        
Revenue 48,158   46,496 46,081
Segment Result 9,252   8,327 7,007
Operating Segments [member] | Information Technology Services [member] | Communications (COMM) [member]        
Disclosure of operating segments [line items]        
Revenue 33,840   32,680 33,658
Segment Result 5,336   4,396 3,236
Operating Segments [member] | Information Technology Products [member]        
Disclosure of operating segments [line items]        
Revenue 11,010   12,312 17,998
Segment Result (282)   (1,047) 362
Segment Result Total (282)   (1,047) 362
Operating Segments [member] | India State Run Enterprise (ISRE) [member]        
Disclosure of operating segments [line items]        
Revenue 8,400   8,544 10,694
Segment Result (1,822)   (1,829) 454
Segment Result Total (1,822)   (1,829) 454
Material Reconciling Items [member]        
Disclosure of operating segments [line items]        
Revenue (50)   (49) (49)
Segment Result 149   283 319
Segment Result Total ₨ 149   ₨ 283 ₨ 319
[1] Value is less than 1