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Income Taxes - Additional Information (Detail) ₨ / shares in Units, ₨ in Millions, $ in Millions | 12 Months Ended |
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Mar. 31, 2018 INR (₨) ₨ / shares | Mar. 31, 2017 INR (₨) ₨ / shares | Mar. 31, 2016 INR (₨) ₨ / shares | Mar. 31, 2018 USD ($)
Disclosure of income tax expense [line items] |  |  |  |
Reversal of provisions pertaining to earlier periods | ₨ 380 | ₨ 593 | ₨ 1,337 |
Deferred tax asset of unused tax losses not recognized | 3,756 | 4,238 |  |
Tax loss carry-forwards | 14,510 | 13,581 |  |
Tax loss carry-forwards not currently subject to expiration dates | 6,223 | 5,371 |  |
Tax loss carry-forwards expires in various years | ₨ 8,287 | 8,210 |  |
Tax loss carry-forwards expiration period | 2037 |  |  |
Deferred tax asset of unused tax losses recognized | ₨ 6,908 | 3,098 |  | $ 106
Minimum alternate tax | 74 | 1,520 |  |
Decrease of current tax expense due to tax holidays | ₨ 11,635 | ₨ 11,958 | ₨ 12,754 |
Tax incentives per share | ₨ / shares | ₨ 2.45 | ₨ 2.46 | ₨ 2.60 |
Deferred tax liabilities on cumulative earnings of subsidiaries | ₨ 51,432 | ₨ 46,905 |  |
Branch profit tax percentage | 15.00% |  |  |
Unused tax losses [member] |  |  |  |
Disclosure of income tax expense [line items] |  |  |  |
Deferred tax asset of unused tax losses recognized | ₨ 5,287 | ₨ 5,513 |  |

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&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 o -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_o&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_56&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + Details
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