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Commitment and Contingencies (Details) (DVA, USD $) In Millions, unless otherwise specified | 9 Months Ended
--- | ---
Jun. 30, 2014
Minimum |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Estimated additional indirect costs and fees associated with contract modification pending final approval | $ 0.4
Maximum |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Estimated additional indirect costs and fees associated with contract modification pending final approval | $ 0.6

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