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Significant Accounting Policies - Goodwill, Income Taxes, and Cash and Cash Equivalents (Details) (USD $)	Mar. 31, 2015	Sep. 30, 2014
Goodwill [Line Items]
Goodwill	$ 8,595,000us-gaap_Goodwill	$ 8,595,000us-gaap_Goodwill
Deferred tax assets	15,700,000us-gaap_DeferredTaxAssetsLiabilitiesNet	15,700,000us-gaap_DeferredTaxAssetsLiabilitiesNet
Valuation allowance	(11,100,000)dlhc_DeferredTaxAssetsValuationAllowanceCurrentandNoncurrent	(11,100,000)dlhc_DeferredTaxAssetsValuationAllowanceCurrentandNoncurrent
Cash, FDIC Insured Amount	$ 250,000us-gaap_CashFDICInsuredAmount

X

- Definition

Deferred Tax Assets, Valuation Allowance, Current and Noncurrent

+ References

No definition available.

+ Details

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Namespace Prefix:	dlhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

Name:	us-gaap_CashFDICInsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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