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LIQUIDITY AND SIGNIFICANT ACCOUNTING POLICIES: (Goodwill And Income Taxes) (Details) (USD $) In Millions, unless otherwise specified			6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Maximum
Goodwill [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:	us-gaap_GoodwillLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration