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ORGANIZATION AND BUSINESS: (Details) | 3 Months Ended
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Dec. 31, 2013 business_area employee location
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Minimum period for which entity has provided professional services to the U.S. Government (years) | 25 years
Number of employees (employee) | 1,200
Minimum number of locations in which entity operates (location) | 25
Number of integrated business areas of DLH Solutions (business area) | 3

X
- Definition Number of persons employed by the Entity + References No definition available. + Details
Name: | dei_EntityNumberOfEmployees
Namespace Prefix: | dei_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of integrated business areas of the entity. + References No definition available. + Details
Name: | dlhc_EntityNumberOfIntegratedBusinessAreas
Namespace Prefix: | dlhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period for which the entity has provided professional services to U.S. Government. + References No definition available. + Details
Name: | dlhc_EntityPeriodOfProfessionalServicesMinimum
Namespace Prefix: | dlhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the minimum number of locations the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | dlhc_NumberOfLocationsInWhichEntityOperatesMinimum
Namespace Prefix: | dlhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration