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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, 2023
INR (₨)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
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 ₨ 109.6 $ 1.3 ₨ 111.1
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 109.6   111.1
Fair Value Measurements Using Significant other observable inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Plan investment assets at fair value 9,945.0 121.0 9,137.1
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 9,829.4   9,016.0
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 60.8   68.1
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 54.8   53.0
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 864.5 $ 10.5 779.8
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 864.5   779.8
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