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Subsequent Events (Details) - USD ($) | May 10, 2018 | Mar. 31, 2018
--- | --- | ---
Line of Credit |  |
Subsequent Event [Line Items] |  |
Line of credit, maximum borrowing capacity |  | $ 10,000,000
Notes Payable to Banks [Member] | Line of Credit |  |
Subsequent Event [Line Items] |  |
Line of credit, maximum borrowing capacity |  | 10,000,000.0
Notes Payable to Banks [Member] | Letter of Credit |  |
Subsequent Event [Line Items] |  |
Line of credit, maximum borrowing capacity |  | $ 1,000,000.0
Subsequent Event | Notes Payable to Banks [Member] | Line of Credit | Fifth Third Bank [Member] |  |
Subsequent Event [Line Items] |  |
Line of credit, maturity extension period | 3 years |
Subsequent Event | Notes Payable to Banks [Member] | Letter of Credit | Fifth Third Bank [Member] |  |
Subsequent Event [Line Items] |  |
Line of credit, maximum borrowing capacity | $ 2,000,000.0 |

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- Definition Line of Credit Facility, Maturity Extension Period + References No definition available. + Details
Name: | dlhc_LineofCreditFacilityMaturityExtensionPeriod
Namespace Prefix: | dlhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableToBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CounterpartyNameAxis=dlhc_FifthThirdBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |