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Goodwill and Intangible Assets - Summary of Movement in Intangible Assets (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨)
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | ₨ 15,922 |  |
Ending balance | 18,113 | $ 278 | ₨ 15,922
Carrying value [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 26,807 |  | 20,947
Translation adjustment | 596 |  | (860)
Acquisition through business combinations | 5,734 |  | 6,720
Ending balance | 33,137 |  | 26,807
Accumulated amortization and impairment [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 10,885 |  | 5,106
Translation adjustment | 25 |  | (75)
Amortization and impairment | 4,114 |  | 5,854
Ending balance | 15,024 |  | 10,885
Customer related intangibles [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 11,264 |  |
Ending balance | 14,323 |  | 11,264
Customer related intangibles [member] | Carrying value [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 20,528 |  | 18,360
Translation adjustment | 493 |  | (546)
Acquisition through business combinations | 5,565 |  | 2,714
Ending balance | 26,586 |  | 20,528
Customer related intangibles [member] | Accumulated amortization and impairment [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 9,264 |  | 4,164
Translation adjustment | 14 |  | (7)
Amortization and impairment | 2,985 |  | 5,107
Ending balance | 12,263 |  | 9,264
Marketing related intangibles [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 4,658 |  |
Ending balance | 3,790 |  | 4,658
Marketing related intangibles [member] | Carrying value [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 6,279 |  | 2,587
Translation adjustment | 103 |  | (314)
Acquisition through business combinations | 169 |  | 4,006
Ending balance | 6,551 |  | 6,279
Marketing related intangibles [member] | Accumulated amortization and impairment [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 1,621 |  | 942
Translation adjustment | 11 |  | (68)
Amortization and impairment | 1,129 |  | 747
Ending balance | ₨ 2,761 |  | ₨ 1,621

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- Definition The increase in intangible assets other than goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in intangible assets other than goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_vii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_c&doctype=Standard -URIDate 2017-03-09 + Details
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