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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, 2021
INR (₨)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
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 ₨ 27.2 $ 0.4 ₨ 118.0
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 27.2   118.0
Fair Value Measurements Using Significant other observable inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Plan investment assets at fair value 7,656.6 104.7 5,156.8
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 7,445.5   4,937.3
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 87.6   110.8
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 123.5   108.7
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 664.1 $ 9.1 600.2
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 664.1   600.2
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