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Financial Instruments - Additional Information (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2015 INR (₨)	Mar. 31, 2015 USD ($)	Mar. 31, 2014 INR (₨)
Financial Instruments [Line Items]
Estimated fair values of bank guarantees	₨ 1,758.7	$ 28.2	₨ 1,480.7
Loan sanction, aggregate of loans contemplated that had not yet been made	628,087.2	10,080.0
Guarantees
Financial Instruments [Line Items]
Guarantees, contingent liability recognized in terms of FASB ASC 450	973.3		846.0
Guarantees
Financial Instruments [Line Items]
Estimated fair values of bank guarantees	₨ 1,509.7	$ 24.2	₨ 1,301.7
Minimum
Financial Instruments [Line Items]
Remaining tenure of guarantees outstanding	1 day
Maximum
Financial Instruments [Line Items]
Remaining tenure of guarantees outstanding	17 years 10 months 24 days

X

- Definition

Financial Instruments [Line Items]

+ References

No definition available.

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Tenure remaining of guarantee obligations.

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Aggregate amount of loans contemplated on Issue of Sanction Letters but not disbursed.

+ References

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Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 460



-SubTopic 10



-Section 50



-Paragraph 5



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12201-110248

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- Definition

Amount of loss contingency liability.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 450



-SubTopic 20



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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