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Loans, Borrowings and Bank Overdrafts - Summary of Changes in Financing Liabilities Arising from Cash and Non-cash Changes (Detail) - INR (₨) ₨ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | ₨ 138,259 | ₨ 142,412
Non cash changes, cash flow | (42,873) | (8,976)
Non cash changes, assets taken on finance lease | 14 | 766
Non cash changes, foreign exchange movements | 4,067 | 5,526
Non cash changes, liabilities directly associated with assets held for sale |  | (1,469)
Ending balance | 99,467 | 138,259
Borrowings from banks [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 119,689 | 120,911
Non cash changes, cash flow | (26,228) | (6,661)
Non cash changes, foreign exchange movements | 3,518 | 5,439
Ending balance | 96,979 | 119,689
Bank overdrafts 1 [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 3,999 | 1,992
Non cash changes, cash flow | (3,995) | 2,007
Ending balance | 4 | 3,999
External commercial borrowings [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 9,777 | 9,728
Non cash changes, cash flow | (10,064) |
Non cash changes, foreign exchange movements | 287 | 49
Ending balance |  | 9,777
Obligations under finance leases [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 3,973 | 8,280
Non cash changes, cash flow | (2,234) | (3,627)
Non cash changes, assets taken on finance lease | 14 | 766
Non cash changes, foreign exchange movements | 249 | 23
Non cash changes, liabilities directly associated with assets held for sale |  | (1,469)
Ending balance | 2,002 | 3,973
Loans from other than bank [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 821 | 1,501
Non cash changes, cash flow | (352) | (695)
Non cash changes, foreign exchange movements | 13 | 15
Ending balance | ₨ 482 | ₨ 821

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- Definition The increase (decrease) in liabilities arising from financing activities resulting from the effect of changes in foreign exchange rates. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 44B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_44B_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase in liabilities arising from financing activities resulting from new leases. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Section A Statement of cash flows for an entity other than a financial institution -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=sect_AStatementofcashflowsforanentityotherthanafinancialinstitution&doctype=Illustrative%20Examples -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 44B -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_44B&doctype=Standard -URIDate 2018-03-16 + Details
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