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Liquidity (Details) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2014
Sep. 30, 2013
Cash and Cash Equivalents [Abstract]            
Cash and cash equivalents $ 4,222,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 3,147,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 4,222,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 3,147,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 3,908,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 3,408,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Net working capital 900,000dlhc_WorkingCapitalNet   900,000dlhc_WorkingCapitalNet      
Accumulated deficit (62,192,000)us-gaap_RetainedEarningsAccumulatedDeficit   (62,192,000)us-gaap_RetainedEarningsAccumulatedDeficit   (62,244,000)us-gaap_RetainedEarningsAccumulatedDeficit  
Operating income 515,000us-gaap_OperatingIncomeLoss 225,000us-gaap_OperatingIncomeLoss 774,000us-gaap_OperatingIncomeLoss 291,000us-gaap_OperatingIncomeLoss    
Net income (82,000)us-gaap_ProfitLoss 197,000us-gaap_ProfitLoss 52,000us-gaap_ProfitLoss 330,000us-gaap_ProfitLoss    
Line of Credit Facility [Line Items]            
Amount of unused availability under the line 2,600,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity   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
  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
  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
  3,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= dlhc_AccountsReceivableFacilityMember
     
Interest rate (percent)         4.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_CreditFacilityAxis
= dlhc_AccountsReceivableFacilityMember
 
Unbilled receivables            
Line of Credit Facility [Line Items]            
Interest rate (percent)         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
  $ 1,400,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember