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Liquidity (Details) (USD $)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2013
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	$ 3,758,000us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 2,566,000us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 3,908,000us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 3,408,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Net working capital	1,100,000dlhc_WorkingCapitalNet
Accumulated deficit	(62,110,000)us-gaap_RetainedEarningsAccumulatedDeficit		(62,244,000)us-gaap_RetainedEarningsAccumulatedDeficit
Operating income	259,000us-gaap_OperatingIncomeLoss	66,000us-gaap_OperatingIncomeLoss
Net income	134,000us-gaap_ProfitLoss	133,000us-gaap_ProfitLoss
Line of Credit Facility [Line Items]
Amount of unused availability under the line	2,600,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum availability	6,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember
Amount of unused availability under the line	1,200,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember
Accounts receivables
Line of Credit Facility [Line Items]
Maximum availability	3,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = dlhc_AccountsReceivableFacilityMember
Interest rate (percent)	4.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_CreditFacilityAxis = dlhc_AccountsReceivableFacilityMember		4.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_CreditFacilityAxis = dlhc_AccountsReceivableFacilityMember
Unbilled receivables
Line of Credit Facility [Line Items]
Maximum availability	1,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = dlhc_UnbilledReceivableFacilityMember
Interest rate (percent)	4.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_CreditFacilityAxis = dlhc_UnbilledReceivableFacilityMember		4.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_CreditFacilityAxis = dlhc_UnbilledReceivableFacilityMember
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Amount of unused availability under the line	$ 1,400,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember

X

- Definition

Represents the net working capital of the entity as of the balance sheet date.

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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