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Long-Term Debt - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2019 INR (₨) | Mar. 31, 2018 INR (₨) | Mar. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |
Subordinated debt, debt raised during the year | ₨ 6,000.0 | ₨ 20,000.0 |
Other long term debt, debt raised during the year | 311,093.6 | 325,517.1 |
Perpetual debt, debt raised during the year | 3,000.0 | 80,000.0 |
Other long-term debt | 833,265.2 | 701,885.6 | $ 12,048.4
Foreign currency borrowings |  |  |
Debt Instrument [Line Items] |  |  |
Other long-term debt | 36,305.9 | 32,260.9 |
Functional currency borrowings |  |  |
Debt Instrument [Line Items] |  |  |
Other long-term debt | ₨ 796,959.3 | ₨ 669,624.7 |

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- Definition Amount of long-term debt classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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