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COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended
	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