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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, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 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 | ₨ 118.0 | $ 1.6 | ₨ 37.1
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 | 118.0 |  | 37.1
Fair Value Measurements Using Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 5,156.8 | 68.4 | 5,059.2
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 | 4,937.3 |  | 4,632.5
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 | 110.8 |  | 106.6
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 | 108.7 |  | 320.1
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 | 600.2 | $ 8.0 | 625.0
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 | 600.2 |  | 625.0
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) | 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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