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v3.25.2

Retirement benefits - Net Pension Cost (Detail) - Pension ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨) | Mar. 31, 2023 INR (₨)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | ₨ 28.4 | $ 0.3 | ₨ 16.0 | ₨ 18.5
Interest cost | 71.6 | 0.8 | 76.4 | 57.3
Expected return on plan assets | (10.5) | (0.1) | (6.5) | (0.4)
Actuarial (gains)/losses | 273.4 | 3.2 | (33.4) | 219.2
Net pension cost | ₨ 362.9 | $ 4.2 | ₨ 52.5 | ₨ 294.6

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