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Retirement benefits - Reconciliation of All Plan Investment Assets Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) - Plan investment funds managed by insurance companies ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Beginning balance | ₨ 859.1 | $ 10.1 | ₨ 864.5
On merger of eHDFC | 0.0 | 0.0 | 25.1
Realized interest credited to fund | 70.2 | 0.8 | 64.0
Contribution during the period | 88.6 | 1.0 | 70.9
Amount paid towards claim | (248.8) | (2.9) | (165.4)
Ending Balance | ₨ 769.1 | $ 9.0 | ₨ 859.1

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