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Plan Investment Assets for Gratuity Funds and Pension Fund Measured at Fair Value by Level and in Total (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2015 INR (₨)	Mar. 31, 2015 USD ($)	Mar. 31, 2014 INR (₨)
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	₨ 99.0	$ 1.6	₨ 164.7
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1) | Funds managed by insurance company (1)
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	0.0		0.0
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1) | Funds managed by insurance company (2)
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	0.0		0.0
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1) | Funds managed by trust | Government of India securities
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	0.0		0.0
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1) | Funds managed by trust | Debenture and bonds
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	0.0		0.0
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1) | Funds managed by trust | Other
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	99.0		164.7
Fair Value Measurements Using Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	2,259.7	36.3	1,637.2
Fair Value Measurements Using Significant other observable inputs (Level 2) | Funds managed by insurance company (1)
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	0.0		0.0
Fair Value Measurements Using Significant other observable inputs (Level 2) | Funds managed by insurance company (2)
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	1,688.6		1,082.3
Fair Value Measurements Using Significant other observable inputs (Level 2) | Funds managed by trust | Government of India securities
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	130.2		113.6
Fair Value Measurements Using Significant other observable inputs (Level 2) | Funds managed by trust | Debenture and bonds
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	440.9		441.3
Fair Value Measurements Using Significant other observable inputs (Level 2) | Funds managed by trust | Other
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	0.0		0.0
Fair Value Measurements Using Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	489.2	$ 7.8	404.0
Fair Value Measurements Using Significant unobservable inputs (Level 3) | Funds managed by insurance company (1)
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	489.2		404.0
Fair Value Measurements Using Significant unobservable inputs (Level 3) | Funds managed by insurance company (2)
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	0.0		0.0
Fair Value Measurements Using Significant unobservable inputs (Level 3) | Funds managed by trust | Government of India securities
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	0.0		0.0
Fair Value Measurements Using Significant unobservable inputs (Level 3) | Funds managed by trust | Debenture and bonds
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	0.0		0.0
Fair Value Measurements Using Significant unobservable inputs (Level 3) | Funds managed by trust | Other
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	₨ 0.0		₨ 0.0

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 30



-Section 35



-Paragraph 50



-URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 20



-Section 50



-Paragraph 1



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