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Supporting Financial Information - Accounts Receivable (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2008	Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 3,231,000us-gaap_AccountsReceivableGrossCurrent		$ 3,231,000us-gaap_AccountsReceivableGrossCurrent			$ 12,372,000us-gaap_AccountsReceivableGrossCurrent
Less: Allowance for doubtful accounts	0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent		0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent			0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts Receivable, Net	3,231,000us-gaap_AccountsReceivableNetCurrent		3,231,000us-gaap_AccountsReceivableNetCurrent			12,372,000us-gaap_AccountsReceivableNetCurrent
Revenue	15,893,000us-gaap_ContractsRevenue	14,745,000us-gaap_ContractsRevenue	31,575,000us-gaap_ContractsRevenue	29,222,000us-gaap_ContractsRevenue
Reduction of accrued payroll related to retroactive wage and benefit payments			8,677,000us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease	0us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease
Settlement of retroactive payment claim, net			(629,000)us-gaap_LossContingencyLossInPeriod	0us-gaap_LossContingencyLossInPeriod
Billed Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	2,695,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember		2,695,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember			2,569,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember
Unbilled Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	536,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember		536,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember			9,803,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember
DVA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract revenue nonrecurring					10,800,000dlhc_ContractRevenueNonrecurring / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = dlhc_DepartmentOfVeteransAffairsMember
Department of Labor | Unfavorable Regulatory Action
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loss Contingency Accrual, Provision					10,100,000us-gaap_LossContingencyAccrualProvision / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_RegulatoryAgencyAxis = dlhc_DepartmentofLaborMember
Employee-related Liabilities, Accrued Payroll Attributable to Retroactive Payment Cases	0dlhc_EmployeerelatedLiabilitiesAccruedPayrollAttributabletoRetroactivePaymentCases / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_RegulatoryAgencyAxis = dlhc_DepartmentofLaborMember		0dlhc_EmployeerelatedLiabilitiesAccruedPayrollAttributabletoRetroactivePaymentCases / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_RegulatoryAgencyAxis = dlhc_DepartmentofLaborMember			8,677,000dlhc_EmployeerelatedLiabilitiesAccruedPayrollAttributabletoRetroactivePaymentCases / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_RegulatoryAgencyAxis = dlhc_DepartmentofLaborMember
Reduction of accrued payroll related to retroactive wage and benefit payments	8,700,000us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_RegulatoryAgencyAxis = dlhc_DepartmentofLaborMember
Settlement of retroactive payment claim, net	(629,000)us-gaap_LossContingencyLossInPeriod / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_RegulatoryAgencyAxis = dlhc_DepartmentofLaborMember
Department of Labor | Unfavorable Regulatory Action | Unbilled Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	0us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_RegulatoryAgencyAxis = dlhc_DepartmentofLaborMember		0us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_RegulatoryAgencyAxis = dlhc_DepartmentofLaborMember			9,306,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_RegulatoryAgencyAxis = dlhc_DepartmentofLaborMember
Accrued Income Receivable | Unbilled Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 536,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_AccruedIncomeReceivableMember / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember		$ 536,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_AccruedIncomeReceivableMember / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember			$ 497,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_AccruedIncomeReceivableMember / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember

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