XML 39 R28.htm IDEA: XBRL DOCUMENT
v3.20.4

New Accounting Pronouncements (Details) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2020 USD ($) lease_concesion
Accounting Changes and Error Corrections [Abstract] |
Number of operating leases accounted for as lease concessions | lease_concesion | 1
Decrease in operating right-of-use assets due to lease concessions | $ 0.1
Decrease in operating lease liabilities due to lease concessions | $ 0.1

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

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

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

X
- References No definition available. + Details
Name: | us-gaap_AccountingChangesAndErrorCorrectionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration