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Commitment and Contingencies (Details) (USD $) |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Minimum DVA | Sep. 30, 2014 Maximum DVA
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Estimated additional indirect costs and fees associated with contract modification pending final approval |  |  | $ 400,000 | $ 600,000
Accrued workers compensation expense | $ 767,000 | $ 563,000 |  |

X
- Definition Represents the estimated additional indirect costs and fees associated with a contract modification pending final approval. + References No definition available. + Details
Name: | dlhc_AdditionalIndirectCostsAndFeesEstimatedAmountPendingApproval
Namespace Prefix: | dlhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
Name: | us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant