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Investments, Available for Sale - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨) | Mar. 31, 2016 INR (₨) | Mar. 31, 2018 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Other than temporary impairment losses on available for sale securities | ₨ 149.1 | $ 2.3 | ₨ 13.4 | ₨ 54.9 |
Available-for-Sale Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available for sale investments, amount eligible towards the Bank's statutory liquidity reserve requirements | 1,866,134.2 |  | 1,657,059.6 |  | $ 28,661.3
Available for sale investments, amount kept as margins for clearing, collateral borrowing and lending obligation (CBLO) and real time gross settlement (RTGS) | 1,354,027.6 |  | 1,200,857.2 |  | $ 20,796.0
Other than temporary impairment losses on available for sale securities | ₨ 149.1 | $ 2.3 | ₨ 13.4 | ₨ 54.9 |

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- Definition The amount of securities on deposit with clearing organizations and other entities which provide services necessary to operations of the Company. This item would include, for instance, securities advanced as refundable collateral for securities borrowed. + 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 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284422-111562 + Details
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