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Loans - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 INR (₨)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans provided as collateral for borrowings | ₨ 406,381.7 |  | $ 5,556.2 | ₨ 574,064.8
Purchased financing receivable outstanding | 710,194.7 |  |  | 644,672.4
Loans receivable restructured due to unexpected event | 138,400.0 | $ 1,900.0 |  |
Retail Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
TDR modifications carrying value | 0.0 |  |  |
Loans receivable restructured due to unexpected event | 137,800.0 |  |  |
Wholesale Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
TDR modifications carrying value |  |  |  | ₨ 0.0
Loans receivable restructured due to unexpected event | ₨ 600.0 |  |  |
Crop related agricultural loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of days past due up to which loans considered current | 90 days | 90 days |  |
Number of past days less than to which Crop Related Agricultural loans are not considered as impaired | 366 days | 366 days |  |
HDB Retail Business Banking [Member] | Retail Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
TDR modifications carrying value | ₨ 0.0 |  |  |

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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5086-111524 + Details
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