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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, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 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 | ₨ 111.1 | $ 1.5 | ₨ 27.2
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) | 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 | 111.1 |  | 27.2
Fair Value Measurements Using Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 9,137.1 | 120.4 | 7,656.6
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 | 9,016.0 |  | 7,445.5
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 | 68.1 |  | 87.6
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 | 53.0 |  | 123.5
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 | 779.8 | $ 10.3 | 664.1
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 | 779.8 |  | 664.1
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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