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Investments, Available for Sale - Additional Information (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2015 INR (₨)	Mar. 31, 2015 USD ($)	Mar. 31, 2014 INR (₨)	Mar. 31, 2013 INR (₨)	Mar. 31, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Other than temporary impairment losses on available for sale securities	₨ 1.8	$ 0.0	₨ 664.7	₨ 1,546.3
Individual investments, fair values of amortized cost	95.00%				95.00%
Available-for-Sale Securities
Schedule of Available-for-sale Securities [Line Items]
Available for sale investments, amount eligible for placement towards the Bank's statutory liquidity ratio requirements	₨ 1,220,330.3		820,565.8		$ 19,584.8
Available for sale investments, amount kept as margins for clearing, collateral borrowing and lending obligation (CBLO) and real time gross settlement (RTGS)	721,933.3		670,603.5		$ 11,586.2
Other than temporary impairment losses on available for sale securities	₨ 1.8		₨ 664.7	₨ 1,546.3

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- Definition

Review of impairment of individual investments that have fair value less than 95% of the amortized cost

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The amount of Securities eligible for placement towards the Bank's Statutory Liquidity Ratio Requirements.

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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://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.8,17)



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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/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 28



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 35



-Paragraph 34



-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560

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