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Related Party Transactions - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨) | Mar. 31, 2015 INR (₨) | Mar. 31, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |
Purchase of investments from others | ₨ 53,163.0 |  | ₨ 35,658.9 |  |
Sale of investments from others | 3,502.0 |  | 3,407.1 |  |
Investments of others | 335,048.9 | $ 5,166.5 | 129,121.4 | ₨ 104,257.6 |
Dividend paid to principal owner | 29,280.9 | $ 451.5 | 24,367.9 | ₨ 19,300.5 |
Foreign exchange and derivative contracts, notional principal amount | 7,422,370.0 |  | 7,861,229.2 |  | $ 114,454.4
Bank guarantees | 729,008.0 |  | 652,140.6 |  | $ 11,241.4
Tier II bonds |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Investments of others | 1,200.0 |  | 900.0 |  |
Principal Owner |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Fixed assets Purchased from related parties | 0.0 |  | 0.0 |  |
Home loans purchased from principal owner | 138,456.5 |  | 127,733.7 |  |
Dividend paid to principal owner | 3,735.5 |  | 3,145.7 |  |
Foreign exchange and derivative contracts, notional principal amount | 6,657.7 |  | 4,912.1 |  |
Foreign exchange and derivative contracts, mark to market gains | 273.3 |  | 99.5 |  |
Payment of debt securities | 23,200.0 |  | 14,150.0 |  |
Bank guarantees | 1.2 |  | 1.4 |  |
Others |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Bank guarantees | ₨ 13.4 |  | ₨ 13.4 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Cash Flows between a transferor and a transferee attributable to purchases of previously transferred financial assets (or its underlying collateral) related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107207-111719 + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Amount of cash inflow from the sale of investments classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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