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Repurchase and Resell Agreements - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
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Mar. 31, 2019 INR (₨) | Mar. 31, 2018 INR (₨) | Mar. 31, 2019 USD ($)
Repurchase Agreement and Resale Agreement Counterparty [Line Items] |  |  |
Securities purchased under agreements to resell | ₨ 76,213.5 | ₨ 650,018.6 | $ 1,102.0
Securities sold under repurchase agreements, amount outstanding | ₨ 174,000.0 | ₨ 138,000.0 | $ 2,515.9
Maximum |  |  |
Repurchase Agreement and Resale Agreement Counterparty [Line Items] |  |  |
Securities purchased under agreements to resell, maturity (days) | 14 days | 14 days |
Securities sold under repurchase agreements, maturity (days) | 14 days | 14 days |

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- Definition Repurchase Agreement and Resale Agreement Counterparty [Line Items] + References No definition available. + Details
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- Definition Maximum maturity period generally of amount outstanding borrowed in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. + References No definition available. + Details
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- Definition Maximum maturity period generally for amount outstanding loaned in the form of a security resale agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. + References No definition available. + Details
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- Definition Amount, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
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- Definition Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
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