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Summary of Significant Accounting Policies - Additional Information (Detail) - Segment | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2020
Significant Accounting Policies [Line Items] |  |
Reportable segments | 3 |
Financial statements translation rate, Indian rupees (Rs.) equivalence of U.S. $1 | 75.87 |
Retail Loans | Personal Loans, Credit Card Receivables, Auto Loans, Commercial Vehicle and Construction Equipment Finance |  |
Significant Accounting Policies [Line Items] |  |
Loans charge off period |  | 150 days
Retail Loans | Housing loans |  |
Significant Accounting Policies [Line Items] |  |
Loans charge off period |  | 720 days
Retail Loans | Retail Business Banking |  |
Significant Accounting Policies [Line Items] |  |
Loans charge off period |  | customer by customer basis
Minimum |  |
Significant Accounting Policies [Line Items] |  |
Bank voting rights | 20.00% |
Minimum | Retail Loans |  |
Significant Accounting Policies [Line Items] |  |
Loans charge off period |  | 150 days
Maximum |  |
Significant Accounting Policies [Line Items] |  |
Bank voting rights | 50.00% |
Maximum | Retail Loans |  |
Significant Accounting Policies [Line Items] |  |
Loans charge off period |  | 1083 days
HDFC Group [Member] | Minimum |  |
Significant Accounting Policies [Line Items] |  |
Percentage of voting rights in which bank consolidates subsidiary | 50.00% |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32618-110901 + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8672-108599 + Details
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