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v3.20.2

Property and Equipment Depreciation Rate Over Estimated Useful Lives of Property and Equipment on Straight-Line Basis (Detail) | 12 Months Ended
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Mar. 31, 2020
Premises |
Property, Plant and Equipment [Line Items] |
Rate of depreciation | 1.63%
Software and systems |
Property, Plant and Equipment [Line Items] |
Rate of depreciation | 20.00%
Equipment and furniture | Minimum |
Property, Plant and Equipment [Line Items] |
Rate of depreciation | 10.00%
Equipment and furniture | Maximum |
Property, Plant and Equipment [Line Items] |
Rate of depreciation | 33.33%

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- Definition Depreciation Rate + References No definition available. + Details
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Namespace Prefix: | hdb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |