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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, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 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	₨ 90.7	$ 1.4	₨ 61.2
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 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	90.7		61.2
Fair Value Measurements Using Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	4,275.8	65.7	3,744.9
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	3,797.4		3,186.0
Fair Value Measurements Using Significant other observable inputs (Level 2) | Funds managed by trust | Government Securities
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	106.0		114.7
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	372.4		444.2
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	519.9	$ 8.0	457.7
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	519.9		457.7
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 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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