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Net Pension Cost (Detail) - Pension $ in Thousands, ₨ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 INR (₨) | Mar. 31, 2019 INR (₨)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | ₨ 14.6 | $ 200 | ₨ 6.5 | ₨ 7.7
Interest cost | 37.7 | 500 | 45.3 | 66.3
Expected return on plan assets | (3.2) | 0 | (11.0) | (18.6)
Actuarial (gains)/losses | 329.6 | 4,500 | 12.4 | 1.7
Net pension cost | ₨ 378.7 | $ 5,200 | ₨ 53.2 | ₨ 57.1

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