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Summary Information Relating to Non-performing Loans (Detail) Loans (Detail) - Gross Loans ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 INR (₨) | Mar. 31, 2019 INR (₨)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average non-performing loans, net of allowance | ₨ 73,435.6 | $ 1,004.0 | ₨ 55,232.3 | ₨ 50,378.2
Interest income recognized on non-performing loans | ₨ 7,025.3 | $ 96.1 | ₨ 10,160.5 | ₨ 6,994.7

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- Definition Amount of interest income on financing receivable on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + Details
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