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Income Tax Expense (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2016 INR (₨) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 INR (₨) | Mar. 31, 2014 INR (₨)
Components of Income Tax Expense Benefit Abstract |  |  |  |  |
Current income tax expense |  | ₨ 68,947.3 | $ 1,040.7 | ₨ 54,954.4 | ₨ 44,324.2
Deferred income tax (benefit) expense | [1] | (1,410.4) | (21.3) | (352.1) | (1,994.6)
Interest on income tax refund |  | 0.0 | 0.0 | (82.4) | (25.4)
Income tax expense |  | ₨ 67,536.9 | $ 1,019.4 | ₨ 54,519.9 | ₨ 42,304.2
[1] | Includes deferred income tax benefits on the amortization of intangible assets of Rs. 495.6 million, Rs. 74.4 million and Rs. 2.4 million for fiscals March 31, 2014, March 31, 2015 and March 31, 2016, respectively.

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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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