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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, 2024 INR (₨)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 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	₨ 581.9	$ 7.0	₨ 109.6
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	581.9		109.6
Fair Value Measurements Using Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	17,672.3	212.1	9,945.0
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	14,478.3		9,829.4
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	1,792.6		60.8
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	1,200.9		54.8
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	200.5		0.0
Fair Value Measurements Using Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Plan investment assets at fair value	859.1	$ 10.4	864.5
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	859.1		864.5
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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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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