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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 3 Months Ended
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Dec. 31, 2012 item
COMMITMENTS AND CONTINGENCIES: |
Number of subsidiaries prior to sale of assets related to PEO operation | 17
Remaining liability for penalties and interest related to payroll taxes | $ 1,300,000
Accrued penalties and interest related to payroll taxes | $ 500,000

X
- Definition Represents the remaining liability for penalties and interest related to payroll taxes. + References No definition available. + Details
Name: | dlhc_LossContingencyPayrollTaxesPenaltiesAndInterestAccrued
Namespace Prefix: | dlhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the penalties and interest sought by IRS related to payroll taxes. + References No definition available. + Details
Name: | dlhc_LossContingencyPayrollTaxesPenaltiesAndInterestSought
Namespace Prefix: | dlhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of subsidiaries of the entity prior to the sale of the assets from discontinued operation in fiscal 2003. + References No definition available. + Details
Name: | dlhc_NumberOfSubsidiariesOperatingBeforeSaleOfAssetsOfDiscontinuedOperationInFiscal2003
Namespace Prefix: | dlhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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