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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, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨)
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | ₨ 18,113 |  |
Ending balance | 13,762 | $ 199 | ₨ 18,113
Carrying value [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 33,137 |  | 26,807
Translation adjustment | 772 |  | 596
Acquisition through business combinations |  |  | 5,734
Disposal (Refer Note 22) | (1,040) |  |
Ending balance | 32,869 |  | 33,137
Accumulated amortization and impairment [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 15,024 |  | 10,885
Translation adjustment | 99 |  | 25
Amortization and impairment | 4,284 |  | 4,114
Disposal (Refer Note 22) | (300) |  |
Ending balance | 19,107 |  | 15,024
Customer related intangibles [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 14,323 |  |
Ending balance | 11,579 |  | 14,323
Customer related intangibles [member] | Carrying value [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 26,586 |  | 20,528
Translation adjustment | 555 |  | 493
Acquisition through business combinations |  |  | 5,565
Disposal (Refer Note 22) | (217) |  |
Ending balance | 26,924 |  | 26,586
Customer related intangibles [member] | Accumulated amortization and impairment [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 12,263 |  | 9,264
Translation adjustment | 35 |  | 14
Amortization and impairment | 3,148 |  | 2,985
Disposal (Refer Note 22) | (101) |  |
Ending balance | 15,345 |  | 12,263
Marketing related intangibles [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 3,790 |  |
Ending balance | 2,183 |  | 3,790
Marketing related intangibles [member] | Carrying value [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 6,551 |  | 6,279
Translation adjustment | 217 |  | 103
Acquisition through business combinations |  |  | 169
Disposal (Refer Note 22) | (823) |  |
Ending balance | 5,945 |  | 6,551
Marketing related intangibles [member] | Accumulated amortization and impairment [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Beginning balance | 2,761 |  | 1,621
Translation adjustment | 64 |  | 11
Amortization and impairment | 1,136 |  | 1,129
Disposal (Refer Note 22) | (199) |  |
Ending balance | ₨ 3,762 |  | ₨ 2,761

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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 2018-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease in intangible assets other than goodwill resulting from disposals. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_ii&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_vii&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_c&doctype=Standard -URIDate 2018-03-16 + Details
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