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Income Taxes - Additional Information (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2016 INR (₨) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 INR (₨) | Mar. 31, 2015 USD ($) | Mar. 31, 2014 INR (₨)
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Income Taxes [Line Items] |  |  |  |  |
Total unrecognized tax benefit | ₨ 648.3 | $ 9.8 | ₨ 648.3 | $ 9.8 | ₨ 648.3
The total unrecognized tax benefits, if recognized, that would reduce the tax provisions and thereby affect the effective tax rate | ₨ 648.3 |  |  |  |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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