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Financial Instruments - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2025 INR (₨) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 INR (₨)
Financial Instruments [Line Items] |  |  |
Estimated fair values of bank guarantees | ₨ 12,875.5 | $ 150.7 | ₨ 10,085.1
Margins in the form of cash and fixed deposit available to the bank to reimburse losses realized under guarantees | 365,600.0 |  | 298,500.0
Outstanding Undrawn commitments to provide loans and financing to customers | 1,222,200.0 | 14,300.0 | 1,175,500.0
Unconditional cancellable commitments | 10,335,600.0 | $ 121,000.0 | 9,108,600.0
Guarantees |  |  |
Financial Instruments [Line Items] |  |  |
Estimated fair values of bank guarantees | ₨ 11,413.0 |  | ₨ 9,066.2
Minimum |  |  |
Financial Instruments [Line Items] |  |  |
Remaining tenure of guarantees outstanding | 1 day |  |
Maximum |  |  |
Financial Instruments [Line Items] |  |  |
Remaining tenure of guarantees outstanding | 30 years 9 months 18 days |  |

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- Definition Financial Instruments [Line Items] + References No definition available. + Details
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- Definition The amount of margin by way cash deposits and fixed deposits available on guarantees. + References No definition available. + Details
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- Definition Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Term of guarantee or group of similar guarantees, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
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