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Long-Term Debt - Additional Information (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2016 INR (₨)	Mar. 31, 2015 INR (₨)	Mar. 31, 2016 USD ($)
Debt Instrument [Line Items]
Other long term debt, debt raised during the year	₨ 129,121.4	₨ 99,257.6
Other long-term debt	358,109.0	282,085.4	$ 5,405.4
Lower tier II capital
Debt Instrument [Line Items]
Subordinated debt, debt raised during the year qualifying for Tier II capital under RBI regulatory guidelines	0.0	5,000.0
Foreign currency borrowings
Debt Instrument [Line Items]
Other long-term debt	140,571.6	125,397.6
Local currency borrowings
Debt Instrument [Line Items]
Other long-term debt	₨ 217,537.4	₨ 156,687.8

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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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Amount of long-term debt classified as other.

+ 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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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-Name Accounting Standards Codification
-Topic 944
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Amount of cash inflow from issuance of long-term debt 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 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6513228

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The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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