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Supporting Financial Information - Accrued Payroll (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Sep. 30, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued current payroll | $ 1,890 us-gaap_AccruedSalariesCurrent | $ 2,440 us-gaap_AccruedSalariesCurrent
Accrued payroll | 11,066 us-gaap_EmployeeRelatedLiabilitiesCurrent | 11,465 us-gaap_EmployeeRelatedLiabilitiesCurrent
Unbilled Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued current payroll | 9,176 us-gaap_AccruedSalariesCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember | 9,025 us-gaap_AccruedSalariesCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = us-gaap_UnbilledRevenuesMember
Retroactive Billings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued current payroll | 8,700 us-gaap_AccruedSalariesCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = dlhc_RetroactiveBillingsMember |
Accrued Payroll |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued current payroll | $ 500 us-gaap_AccruedSalariesCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = dlhc_AccruedPayrollMember | $ 300 us-gaap_AccruedSalariesCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis = dlhc_AccruedPayrollMember

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- Definition Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6911-107765 + Details
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- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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