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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