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Segment Information - Summary of Information on Reportable Segments (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2016
INR (₨)
Disclosure of operating segments [line items]        
Revenue ₨ 544,871 $ 8,368 ₨ 550,402 ₨ 512,440
Segment Result Total 84,294 1,295 93,879 96,860
Finance expense (5,830) (90) (5,942) (5,378)
Finance and other income 23,999 369 22,419 23,451
Share of profit/ (loss) of equity accounted investee 11      
Profit before tax 102,474 1,574 110,356 114,933
Income tax expense (22,390) (344) (25,213) (25,366)
Profit for the year 80,084 $ 1,230 85,143 89,567
Depreciation and amortization 21,124   23,107 14,965
Information Technology Services [member]        
Disclosure of operating segments [line items]        
Other operating income     4,082  
Operating Segments [member]        
Disclosure of operating segments [line items]        
Revenue 546,359   554,179 516,307
Other operating income     4,082  
Segment Result 80,947   90,748 95,796
Unallocated 3,347   (951) 1,064
Operating Segments [member] | Information Technology Services [member]        
Disclosure of operating segments [line items]        
Revenue 528,410   528,440 487,316
Other operating income     4,082  
Segment Result 80,266   92,934 97,189
Unallocated 3,347   (951) 1,064
Segment Result Total 83,613   96,065 98,253
Operating Segments [member] | Information Technology Services [member] | Banking Financial Services and Insurance (BFSI) [member]        
Disclosure of operating segments [line items]        
Revenue 148,062   135,967 128,147
Segment Result 24,626   24,939 27,902
Operating Segments [member] | Information Technology Services [member] | Healthcare and Lifesciences (HLS) [member]        
Disclosure of operating segments [line items]        
Revenue 74,177   82,242 58,358
Segment Result 9,620   9,479 12,009
Operating Segments [member] | Information Technology Services [member] | Consumer Business Unit (CBU) [member]        
Disclosure of operating segments [line items]        
Revenue 83,762   83,417 79,514
Segment Result 13,060   14,493 13,590
Operating Segments [member] | Information Technology Services [member] | Energy, Natural Resources and Utilities (ENU) [member]        
Disclosure of operating segments [line items]        
Revenue 68,427   68,883 70,866
Segment Result 8,060   14,421 13,475
Operating Segments [member] | Information Technology Services [member] | Manufacturing and Technology (MNT) [member]        
Disclosure of operating segments [line items]        
Revenue 120,272   119,175 113,422
Segment Result 21,742   23,453 24,223
Operating Segments [member] | Information Technology Services [member] | Communications (COMM) [member]        
Disclosure of operating segments [line items]        
Revenue 33,710   38,756 37,009
Segment Result 3,158   6,149 5,990
Operating Segments [member] | Information Technology Products [member]        
Disclosure of operating segments [line items]        
Revenue 17,998   25,922 29,722
Segment Result 362   (1,680) (1,007)
Segment Result Total 362   (1,680) (1,007)
Material Reconciling Items [member]        
Disclosure of operating segments [line items]        
Revenue (49)   (183) (731)
Segment Result 319   (506) (386)
Segment Result Total ₨ 319   ₨ (506) ₨ (386)