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New Accounting Pronouncements (Details) - COVID-19 $ in Millions | 9 Months Ended
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Jun. 30, 2021 USD ($) lease_concesion
New Accounting Pronouncement, Early Adoption [Line Items] |
Number of operating leases accounted for as lease concessions | lease_concesion | 1
Decrease in operating lease liabilities due to lease concessions | $ 0.1
Decrease in operating right-of-use assets due to lease concessions | $ 0.1

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- Definition Number Of Operating Lease Concessions + References No definition available. + Details
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Namespace Prefix: | dlhc_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Operating Lease Liability, Decrease Due To Lease Concessions + References No definition available. + Details
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Namespace Prefix: | dlhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Right-of-use Asset, Decrease Due to Lease Concessions + References No definition available. + Details
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Namespace Prefix: | dlhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_UnusualOrInfrequentItemAxis=dlhc_COVID19PandemicMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |