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ORGANIZATION AND BUSINESS: (Details)	9 Months Ended
	Jun. 30, 2012 item
ORGANIZATION AND BUSINESS:
Minimum period for which entity has provided professional services to the U.S. Government	25 years
Number of employees	1,000
Minimum number of locations in which entity operates	25

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 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