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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, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨)
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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 | ₨ 37.1 | $ 0.5 | ₨ 90.7
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) | Government Securities Managed by Trust |  |  |
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) | Debenture and Bonds Managed by Trust |  |  |
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) | Other Funds Managed by Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 37.1 |  | 90.7
Fair Value Measurements Using Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 5,059.2 | 73.2 | 4,275.8
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 | 4,632.5 |  | 3,797.4
Fair Value Measurements Using Significant other observable inputs (Level 2) | Government Securities Managed by Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 106.6 |  | 106.0
Fair Value Measurements Using Significant other observable inputs (Level 2) | Debenture and Bonds Managed by Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 320.1 |  | 372.4
Fair Value Measurements Using Significant other observable inputs (Level 2) | Other Funds Managed by Trust |  |  |
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 | 625.0 | $ 9.0 | 519.9
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 | 625.0 |  | 519.9
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) | Government Securities Managed by Trust |  |  |
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) | Debenture and Bonds Managed by Trust |  |  |
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) | Other Funds Managed by Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | ₨ 0.0 |  | ₨ 0.0

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