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Supporting Financial Information - Accounts Receivable (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2008 | Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total accounts receivable | $ 12,277,000 us-gaap_AccountsReceivableGrossCurrent |  |  | $ 12,372,000 us-gaap_AccountsReceivableGrossCurrent
Less: Allowance for doubtful accounts | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  |  | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts Receivable, Net | 12,277,000 us-gaap_AccountsReceivableNetCurrent |  |  | 12,372,000 us-gaap_AccountsReceivableNetCurrent
Revenue | 15,682,000 us-gaap_ContractsRevenue | 14,477,000 us-gaap_ContractsRevenue |  |
Billed Receivables |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total accounts receivable | 2,189,000 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember |  |  | 2,569,000 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember
Unbilled Receivables |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total accounts receivable | 10,088,000 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember |  |  | 9,803,000 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember
Retroactive Billings |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total accounts receivable | 9,300,000 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = dlhc_RetroactiveBillingsMember |  |  |
Unbilled Accounts Receivable |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total accounts receivable | 800,000 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = dlhc_UnbilledAccountsReceivableMember |  |  | 500,000 us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = dlhc_UnbilledAccountsReceivableMember
DVA |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Contract revenue nonrecurring |  |  | 10,800,000 dlhc_ContractRevenueNonrecurring / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = dlhc_DepartmentOfVeteransAffairsMember |
Revenue |  |  | $ 1,500,000 us-gaap_ContractsRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = dlhc_DepartmentOfVeteransAffairsMember |

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