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Supporting Financial Information - Accrued Payroll (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued current payroll $ 1,890us-gaap_AccruedSalariesCurrent $ 2,440us-gaap_AccruedSalariesCurrent
Accrued payroll 11,066us-gaap_EmployeeRelatedLiabilitiesCurrent 11,465us-gaap_EmployeeRelatedLiabilitiesCurrent
Unbilled Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued current payroll 9,176us-gaap_AccruedSalariesCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_UnbilledRevenuesMember
9,025us-gaap_AccruedSalariesCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_UnbilledRevenuesMember
Retroactive Billings    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued current payroll 8,700us-gaap_AccruedSalariesCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= dlhc_RetroactiveBillingsMember
 
Accrued Payroll    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued current payroll $ 500us-gaap_AccruedSalariesCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= dlhc_AccruedPayrollMember
$ 300us-gaap_AccruedSalariesCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= dlhc_AccruedPayrollMember