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Summary Information Relating to Impaired Loans (Detail) - Gross Loans ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2015 INR (₨)	Mar. 31, 2015 USD ($)	Mar. 31, 2014 INR (₨)	Mar. 31, 2013 INR (₨)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average impaired loans, net of allowance	₨ 11,826.6	$ 189.8	₨ 6,851.3	₨ 4,191.7
Interest income recognized on impaired loans	₨ 1,898.0	$ 30.5	₨ 1,664.7	₨ 1,647.8

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 15



-Subparagraph (c)(2)



-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 15



-Subparagraph (c)(1)



-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 17



-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524

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