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Segment Information - Summary of Information on Reportable Segments (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Disclosure of operating segments [line items]        
Revenue ₨ 585,845 $ 8,471 ₨ 544,871 ₨ 550,402
Segment Result Total 99,910 1,444 84,294 93,879
Finance expense (7,375) (107) (5,830) (5,942)
Finance and other income 22,923 331 23,999 22,419
Share of net loss of associates accounted for using the equity method (43) (1) 11  
Profit before tax 115,415 1,667 102,474 110,356
Income tax expense (25,242) (365) (22,390) (25,213)
Profit for the year 90,173 $ 1,302 80,084 85,143
Depreciation, amortization and impairment 19,474   21,124 23,107
Information Technology Services [member]        
Disclosure of operating segments [line items]        
Other operating income 4,344      
Operating Segments [member]        
Disclosure of operating segments [line items]        
Revenue 589,060   546,359 554,179
Other operating income 4,344     4,082
Segment Result 92,424   80,947 90,748
Unallocated 3,142   3,347 (951)
Operating Segments [member] | Information Technology Services [member]        
Disclosure of operating segments [line items]        
Revenue 568,253   517,716 519,196
Other operating income 4,344     4,082
Segment Result 95,017   79,812 95,260
Unallocated 3,142   3,347 (951)
Segment Result Total 102,503   83,159 98,391
Operating Segments [member] | Information Technology Services [member] | Banking Financial Services and Insurance (BFSI) [member]        
Disclosure of operating segments [line items]        
Revenue 175,262   144,139 133,332
Segment Result 33,831   24,549 25,721
Operating Segments [member] | Information Technology Services [member] | Health Business unit [member]        
Disclosure of operating segments [line items]        
Revenue 75,081   74,136 81,980
Segment Result 8,638   9,624 9,524
Operating Segments [member] | Information Technology Services [member] | Consumer Business Unit (CBU) [member]        
Disclosure of operating segments [line items]        
Revenue 89,313   77,914 78,101
Segment Result 16,828   12,619 15,928
Operating Segments [member] | Information Technology Services [member] | Energy, Natural Resources and Utilities (ENU) [member]        
Disclosure of operating segments [line items]        
Revenue 72,830   67,841 68,223
Segment Result 7,081   8,097 14,485
Operating Segments [member] | Information Technology Services [member] | Technology [member]        
Disclosure of operating segments [line items]        
Revenue 76,591   73,947 72,069
Segment Result 15,916   14,680 16,634
Operating Segments [member] | Information Technology Services [member] | Manufacturing [member]        
Disclosure of operating segments [line items]        
Revenue 46,496   46,081 46,907
Segment Result 8,327   7,007 6,843
Operating Segments [member] | Information Technology Services [member] | Communications (COMM) [member]        
Disclosure of operating segments [line items]        
Revenue 32,680   33,658 38,584
Segment Result 4,396   3,236 6,125
Operating Segments [member] | Information Technology Products [member]        
Disclosure of operating segments [line items]        
Revenue 12,312   17,998 25,922
Segment Result (1,047)   362 (1,680)
Segment Result Total (1,047)   362 (1,680)
Operating Segments [member] | India State Run Enterprise (ISRE) [member]        
Disclosure of operating segments [line items]        
Revenue 8,544   10,694 9,244
Segment Result (1,829)   454 (2,326)
Segment Result Total (1,829)   454 (2,326)
Material Reconciling Items [member]        
Disclosure of operating segments [line items]        
Revenue (49)   (49) (183)
Segment Result 283   319 (506)
Segment Result Total ₨ 283   ₨ 319 ₨ (506)