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Net Pension Cost (Detail) - Pension ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨) | Mar. 31, 2020 INR (₨)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | ₨ 93.0 | $ 1.2 | ₨ 14.6 | ₨ 6.5
Interest cost | 55.8 | 0.7 | 37.7 | 45.3
Expected return on plan assets | (0.4) | 0.0 | (3.2) | (11.0)
Actuarial (gains)/losses | 32.1 | 0.4 | 329.6 | 12.4
Net pension cost | ₨ 180.5 | $ 2.3 | ₨ 378.7 | ₨ 53.2

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