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Movement in Provision for Credit Card and Debit Card Reward Points (Detail) - Debit and Credit Cards Reward Points ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨)
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Opening provision of reward points | ₨ 6,387.9 | $ 84.2 | ₨ 7,341.5
Provision made during the year | 4,651.3 | 61.3 | 3,752.1
Utilization/write back of provision | (4,137.7) | (54.5) | (4,026.7)
Closing provision of reward points | 6,359.1 | 83.9 | 6,387.9
Change in Rate of Accrual of Reward Points |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Effect of change in rate of accrual of points/cost of reward | ₨ (542.4) | $ (7.1) | ₨ (679.0)

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