Deposits - Additional Information (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2015 INR (₨)	Mar. 31, 2015 USD ($)	Mar. 31, 2014 INR (₨)
Time Deposits [Line Items]
Time deposits with residual maturity of less than one year	₨ 1,737,103.7	$ 27,878.4	₨ 1,327,554.2
Time deposits	2,519,412.7	$ 40,433.5	2,025,828.4
Deposit in excess of Rs. 100000
Time Deposits [Line Items]
Time deposits	₨ 2,365,836.3		₨ 1,872,806.1

Amount of time deposits maturing in the next fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Name:	us-gaap_TimeDepositMaturitiesYearOne
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant