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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)

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