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Business Overview (Details) | 6 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Concentration Risk [Line Items] |  |
Minimum period for which entity has provided professional services to the U.S. Government (years) | 25 years |
Number of employees (employee) | 1,200 dei_EntityNumberOfEmployees |
Minimum number of locations in which entity operates (location) | 25 dlhc_NumberOfLocationsInWhichEntityOperatesMinimum |
Number of broad integrated revenue streams | 2 dlhc_EntityNumberofIntegratedRevenueStreams |
US Government [Member] | Revenue concentration | Customer concentration |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage (percent) | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = dlhc_USGovernmentMember | 100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = dlhc_USGovernmentMember
DVA | Revenue concentration | Customer concentration |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage (percent) | 96.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = dlhc_DepartmentOfVeteransAffairsMember | 97.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueServicesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = dlhc_DepartmentOfVeteransAffairsMember
DVA | Minimum |  |
Concentration Risk [Line Items] |  |
Term of government contract | 2 years |
DVA | Maximum |  |
Concentration Risk [Line Items] |  |
Term of government contract | 4 years |

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