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v3.25.2

Income Taxes - Reconciliation of Beginning and Ending Balance of Unrecognized Tax Benefits (Detail) ₨ 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 (₨)
Income Tax Contingency [Line Items] |  |  |  |
Opening balance | ₨ 22,042.3 | $ 258.0 | ₨ 48,792.1 | ₨ 46,774.3
Increase related to acquisition of eHDFC | 0.0 | 0.0 | 52,980.5 | 0.0
Decrease related to prior year tax positions | (16,515.6) | (193.3) | (80,874.4) | 0.0
Increase related to current year tax positions | 1,190.6 | 13.9 | 1,144.1 | 2,017.8
Closing balance | ₨ 6,717.3 | $ 78.6 | ₨ 22,042.3 | ₨ 48,792.1

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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A + Details
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