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Other Liabilities and Provisions - Summary of Activity for Provision for Warranty and Other Provisions (Detail) - INR (₨) ₨ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disclosure of other provisions [line items] |  |
Balance at the beginning of the year | ₨ 799 | ₨ 1,274
Additional provision during the year | 308 | 324
Provision used during the year | (467) | (799)
Balance at the end of the year | 640 | 799
Provision for warranty [member] |  |
Disclosure of other provisions [line items] |  |
Balance at the beginning of the year | 293 | 440
Additional provision during the year | 295 | 317
Provision used during the year | (311) | (464)
Balance at the end of the year | 277 | 293
Other provisions [member] |  |
Disclosure of other provisions [line items] |  |
Balance at the beginning of the year | 506 | 834
Additional provision during the year | 13 | 7
Provision used during the year | (156) | (335)
Balance at the end of the year | ₨ 363 | ₨ 506

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- Definition The amount of additional other provisions made. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_b&doctype=Standard -URIDate 2018-03-16 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of provisions other than provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_d&doctype=Standard -URIDate 2018-03-16 + Details
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Period Type: | instant

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- Definition The amount used (ie incurrent and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Balance Type: |
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