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LIQUIDITY AND SIGNIFICANT ACCOUNTING POLICIES: (Narrative) (Details) (USD $) In Millions, unless otherwise specified |  |  | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Maximum
Summary of Significant Accounting Policies [Line Items] |  |  |
Charge to be expensed, if an impairment of all the goodwill became necessary |  |  | $ 8.6
Valuation allowance against deferred tax assets (percent) | 100.00% | 100.00% |

X
- Definition Represents the amount of loss which is contingent in nature related to write down of goodwill. + References No definition available. + Details
Name: | dlhc_ContingentGoodwillImpairmentLoss
Namespace Prefix: | dlhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the percentage of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References No definition available. + Details
Name: | dlhc_DeferredTaxAssetsValuationAllowancePercentage
Namespace Prefix: | dlhc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dlhc_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | dlhc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration