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Significant Accounting Policies - Goodwill And Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014
Goodwill [Line Items] |  |
Deferred tax assets | $ 15.6 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 15.7 us-gaap_DeferredTaxAssetsLiabilitiesNet
Valuation allowance | 11.1 dlhc_DeferredTaxAssetsValuationAllowanceCurrentandNoncurrent |
Maximum |  |
Goodwill [Line Items] |  |
Charge to be expensed, if an impairment of all the goodwill became necessary | $ 8.6 dlhc_ContingentGoodwillImpairmentLoss / us-gaap_RangeAxis = us-gaap_MaximumMember |

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 Deferred Tax Assets, Valuation Allowance, Current and Noncurrent + References No definition available. + Details
Name: | dlhc_DeferredTaxAssetsValuationAllowanceCurrentandNoncurrent
Namespace Prefix: | dlhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
Name: | us-gaap_DeferredTaxAssetsLiabilitiesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |