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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

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