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Long-Term Debt - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨) | Mar. 31, 2015 INR (₨) | Mar. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Other long term debt, debt raised during the year | ₨ 335,048.9 | $ 5,166.5 | ₨ 129,121.4 | ₨ 104,257.6 |
Other long-term debt | 581,969.0 |  | 358,109.0 |  | $ 8,974.1
Lower tier II capital |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Subordinated debt, debt raised during the year qualifying for Tier II capital under RBI regulatory guidelines | 0.0 |  | 0.0 |  |
Foreign currency borrowings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Other long-term debt | 62,353.1 |  | 140,571.6 |  |
Functional currency borrowings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Other long-term debt | ₨ 519,615.9 |  | ₨ 217,537.4 |  |

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- Definition Amount of long-term debt classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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