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Subsidiaries - Additional Information (Detail) | Dec. 01, 2016 ₨ / shares shares | Mar. 31, 2018 ₨ / shares | Mar. 31, 2017 ₨ / shares
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Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Equity shares, par value |  | ₨ 2 | ₨ 2
HDFC Securities Ltd. |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
The stake-holding of the Bank |  | 97.90% |
Atlas Documentary Facilitators Company Private Ltd |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
The stake-holding of the Bank | 59.00% |  |
Atlas Documentary Facilitators Company Private Ltd | HDB Financial Services Limited |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Equity shares, issued | shares | 7,540,515 |  |
Equity shares, par value | ₨ 10 |  |
Share exchange ratio | 16.75 |  |
HBL Global Private Ltd | HDB Financial Services Limited |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Equity shares, issued | shares | 20,470 |  |
Equity shares, par value | ₨ 10 |  |
Share exchange ratio | 102.35 |  |
HBL Global Private Ltd | Atlas Documentary Facilitators Company Private Ltd |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
The stake-holding of the Bank |  | 98.00% |
HDB Financial Services Limited |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
The stake-holding of the Bank |  | 96.40% |

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