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Business Overview (Details) | 3 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
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) | 97.00%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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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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