Commitment and Contingencies (Details) (DVA, USD $) In Millions, unless otherwise specified	9 Months Ended
Jun. 30, 2014
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Estimated additional indirect costs and fees associated with contract modification pending final approval	$ 0.4
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Estimated additional indirect costs and fees associated with contract modification pending final approval	$ 0.6

Represents the estimated additional indirect costs and fees associated with a contract modification pending final approval.

No definition available.

Name:	dlhc_AdditionalIndirectCostsAndFeesEstimatedAmountPendingApproval
Namespace Prefix:	dlhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration