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Income Taxes - Movement in Deferred Tax Assets and Liabilities (Detail) - INR (₨) ₨ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | ₨ (3,516) | ₨ (822) | ₨ (295)
Credit/(charge) in the consolidated statement of Changes in equity on adoption of IFRS 9 |  |  | 430
Credit/(charge) in the consolidated statement of income | 3,944 | 1,288 | 391
Credit/(charge) in the Other comprehensive income | 1,573 | (1,218) | 795
On account of business combination | (113) | (2,764) | (2,143)
Assets held for sale | 1,961 |  |
Ending balance | 3,849 | (3,516) | (822)
Carry-forward losses [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | 5,513 | 5,250 | 3,589
Credit/(charge) in the consolidated statement of income | 133 | 825 | 147
Credit/(charge) in the Other comprehensive income | 48 | (562) | (90)
On account of business combination |  |  | 1,604
Ending balance | 5,694 | 5,513 | 5,250
Accrued expenses and liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | 3,151 | 3,270 | 2,546
Credit/(charge) in the consolidated statement of income | 243 | (44) | 500
Credit/(charge) in the Other comprehensive income | (246) | (75) | 224
Assets held for sale | (41) |  |
Ending balance | 3,107 | 3,151 | 3,270
Allowances for lifetime expected credit loss [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | 2,955 | 3,039 | 1,859
Credit/(charge) in the consolidated statement of Changes in equity on adoption of IFRS 9 |  |  | 430
Credit/(charge) in the consolidated statement of income | 1,564 | (77) | 751
Credit/(charge) in the Other comprehensive income | 2 | (7) | (1)
Assets held for sale | (22) |  |
Ending balance | 4,499 | 2,955 | 3,039
Minimum alternate tax [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | 1,520 | 1,457 | 1,844
Credit/(charge) in the consolidated statement of income | (1,446) | 63 | (387)
Ending balance | 74 | 1,520 | 1,457
Property, plant and equipment [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | (4,153) | (4,262) | (3,416)
Credit/(charge) in the consolidated statement of income | 912 | (249) | (827)
Credit/(charge) in the Other comprehensive income | (75) | 358 | (19)
Assets held for sale | 1,150 |  |
Ending balance | (2,166) | (4,153) | (4,262)
Amortizable goodwill [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | (4,057) | (3,963) | (3,347)
Credit/(charge) in the consolidated statement of income | 1,522 | (401) | (977)
Credit/(charge) in the Other comprehensive income | (53) | 307 | 361
Assets held for sale | 778 |  |
Ending balance | (1,810) | (4,057) | (3,963)
Intangible assets [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | (4,511) | (4,665) | (1,965)
Credit/(charge) in the consolidated statement of income | 1,546 | 2,639 | 989
Credit/(charge) in the Other comprehensive income | (112) | 279 | 58
On account of business combination | (113) | (2,764) | (3,747)
Ending balance | (3,190) | (4,511) | (4,665)
Interest on bonds and fair value movement of investments [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | (2,245) | (814) | (448)
Credit/(charge) in the consolidated statement of income | (112) | (837) | (324)
Credit/(charge) in the Other comprehensive income | 645 | (594) | (42)
Ending balance | (1,712) | (2,245) | (814)
Cash flow hedges [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | (1,419) | (458) | (719)
Credit/(charge) in the consolidated statement of income |  |  | 1
Credit/(charge) in the Other comprehensive income | 1,448 | (961) | 260
Ending balance | 29 | (1,419) | (458)
Deferred revenue [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | (183) | (4) | (418)
Credit/(charge) in the consolidated statement of income | (35) | (192) | 377
Credit/(charge) in the Other comprehensive income | (9) | 13 | 37
Assets held for sale | (46) |  |
Ending balance | (273) | (183) | (4)
Others [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | (87) | 328 | 180
Credit/(charge) in the consolidated statement of income | (383) | (439) | 141
Credit/(charge) in the Other comprehensive income | (75) | 24 | 7
Assets held for sale | 142 |  |
Ending balance | ₨ (403) | ₨ (87) | ₨ 328

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2017-03-09 + Details
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