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v3.25.2

Commitments and Contingencies - Movement in Provision for Credit Card and Debit Card Reward Points (Detail) - Credit card and debit card reward points ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨)
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Opening provision of reward points | ₨ 8,635.5 | $ 101.0 | ₨ 6,963.2
Provision made during the year | 9,335.1 | 109.3 | 7,921.1
Utilization/write back of provision | (7,496.2) | (87.7) | (6,248.8)
Closing provision of reward points | 10,474.4 | 122.6 | 8,635.5
Change in Rate of Accrual of Reward Points |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Effect of change in rate of accrual of reward points | ₨ 0.0 | $ 0.0 | ₨ 0.0

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