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Supporting Financial Information - Other Income (Expense) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest expense, net | $ (25)us-gaap_InterestExpense | $ (29)us-gaap_InterestExpense | $ (49)us-gaap_InterestExpense | $ (51)us-gaap_InterestExpense
Amortization of deferred financing costs | 0 us-gaap_AmortizationOfFinancingCosts | 0 us-gaap_AmortizationOfFinancingCosts | 0 us-gaap_AmortizationOfFinancingCosts | (10)us-gaap_AmortizationOfFinancingCosts
Change in value of financial instruments | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | 99 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Miscellaneous other income (expense), net | (626)us-gaap_OtherNonoperatingIncome | 1 us-gaap_OtherNonoperatingIncome | (638)us-gaap_OtherNonoperatingIncome | 1 us-gaap_OtherNonoperatingIncome
Other income (expense) net | (651)us-gaap_NonoperatingIncomeExpense | (28)us-gaap_NonoperatingIncomeExpense | (687)us-gaap_NonoperatingIncomeExpense | 39 us-gaap_NonoperatingIncomeExpense
Settlement of retroactive payment claim, net |  |  | (629)us-gaap_LossContingencyLossInPeriod | 0 us-gaap_LossContingencyLossInPeriod
Unfavorable Regulatory Action | Department of Labor |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Settlement of retroactive payment claim, net | $ (629)us-gaap_LossContingencyLossInPeriod / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_RegulatoryAgencyAxis = dlhc_DepartmentofLaborMember |  |  |

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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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