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Supporting Financial Information - Accounts Receivable (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2008	Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 12,277,000us-gaap_AccountsReceivableGrossCurrent			$ 12,372,000us-gaap_AccountsReceivableGrossCurrent
Less: Allowance for doubtful accounts	0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent			0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts Receivable, Net	12,277,000us-gaap_AccountsReceivableNetCurrent			12,372,000us-gaap_AccountsReceivableNetCurrent
Revenue	15,682,000us-gaap_ContractsRevenue	14,477,000us-gaap_ContractsRevenue
Billed Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	2,189,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember			2,569,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_BilledRevenuesMember
Unbilled Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	10,088,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember			9,803,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember
Retroactive Billings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	9,300,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = dlhc_RetroactiveBillingsMember
Unbilled Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	800,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = dlhc_UnbilledAccountsReceivableMember			500,000us-gaap_AccountsReceivableGrossCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = dlhc_UnbilledAccountsReceivableMember
DVA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract revenue nonrecurring			10,800,000dlhc_ContractRevenueNonrecurring / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = dlhc_DepartmentOfVeteransAffairsMember
Revenue			$ 1,500,000us-gaap_ContractsRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = dlhc_DepartmentOfVeteransAffairsMember

X

- Definition

Represents the revenue earned during the period arising from services provided under the terms of a contract related to retroactive billings which are nonrecurring.

+ References

No definition available.

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- Definition

Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

+ 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 210.5-02.3)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Subparagraph a, b

-Article 5

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ 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 210.5-02.3-4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524



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-Topic 210

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- Definition

Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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