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Significant Accounting Policies - Goodwill And Income Taxes (Details) (USD $) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2013 | Sep. 30, 2014 Maximum
Goodwill [Line Items] |  |  |  |
Deferred Tax Assets, Valuation Allowance | $ 11,100,000 | $ 16,037,000 |  |
Charge to be expensed, if an impairment of all the goodwill became necessary |  |  |  | $ 8,600,000
Valuation allowance against deferred tax assets (percent) |  |  | 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 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 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