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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 item | Sep. 30, 2012 | Dec. 31, 2012
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 | $ 1,400,000 |  | $ 1,300,000
Accrued penalties and interest related to payroll taxes | 600,000 |  |
Maximum percentage of annual salary used to calculate ump sum payemtn in event of change in control | 150.00% |  |
Payments made for payroll taxes | 0 | 0 |
Wage adjustment required | $ 0 |  |

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 This element represents the percentage of annual salary that is due to an employee in the event of a change in control of the Company. Payment will be made in the form a a lump sum equal to the employee's annual salary multiplied by the percentage. + References No definition available. + Details
Name: | dlhc_MaximumPercentageOfAnnualSalaryDueToEmployeesPerEmploymentAgreement
Namespace Prefix: | dlhc_
Data Type: | num:percentItemType
Balance Type: | na
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
- Definition Represents the amount of statutory payroll taxes paid through that date. + References No definition available. + Details
Name: | dlhc_PaymentOfPayrollTaxes
Namespace Prefix: | dlhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of wage adjustments required to be made by the entity. + References No definition available. + Details
Name: | dlhc_WageAdjustmentsRequired
Namespace Prefix: | dlhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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