Business Overview	3 Months Ended
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Overview	Business Overview DLH is a full-service provider of technology-enabled health and readiness enhancement services to government agencies including the Department of Veteran Affairs ("VA"), Department of Health and Human Services ("HHS"), Department of Defense ("DoD"), and other government agencies. DLH Holdings Corp. (together with its subsidiaries, "DLH" or the "Company" and also referred to as "we," "us" and "our") manages its operations from its principal executive offices in Atlanta, Georgia. We have complementary headquarters offices in Silver Spring, Maryland. We employ over 1,600 skilled employees working in more than 30 locations throughout the United States. Presently, the Company derives 100% of its revenue from agencies of the federal government, primarily as a prime contractor but also as a subcontractor to other Federal prime contractors. A major customer is defined as a customer from whom the Company derives at least 10% of its revenues. Our largest customer continues to be the VA, which comprised approximately 68% and 66% of revenue for the three months ended December 31, 2018 and 2017, respectively. Additionally, HHS, which comprised approximately 30% and 32% of revenue for the three months ended December 31, 2018 and 2017, respectively, represents a major customer. Our current contracts are within the following markets: Defense/VA (69%), Human Services and Solutions (29%) and Public Health/Life Sciences (2%); of which 97% of these contracts have been awarded on a Time and Materials basis, 2% are Cost Plus Fixed Fee contracts and 1% are Firm Fixed Price contracts. For additional information, see Note 4, Revenue Recognition. In addition, substantially all accounts receivable, including contract assets, are from agencies of the U.S. Government as of December 31, 2018 and September 30, 2018. We generally operate as a prime contractor, but have also entered into contracts as a subcontractor. The Company's current business base is 99% prime contracts and 1% subcontracts. We believe that the credit risk associated with our receivables is limited due to the creditworthiness of these customers. See Note 5, Supporting Financial Information-Accounts Receivable. The VA comprised approximately 68% and 66% of revenue for the three months ended December 31, 2018 and 2017, which was derived from 16 separate contracts related to its performance of pharmacy and logistics services in support of the VA's consolidated mail outpatient pharmacy program. Approximately 58% of the Company's current business base with the VA is derived from nine contracts (for pharmacy services), which are currently operating under extensions through April 30, 2019 pending completion of the procurement process for a new contract. We believe further extensions are possible until the procurement is completed. A single renewal request for proposal ("RFP") has currently been issued for these contracts that requires the prime contractor be a service-disabled veteran owned small business (SDVOSB), which precludes the Company from bidding on the RFP as a prime contractor. The Company has joined an SDVOSB team as a subcontractor to respond to this RFP. Should the contract be awarded to an SDVOSB partner of DLH, the Company expects to continue to perform a significant amount of the contract's volume of business. The remaining seven contracts for logistics services to the VA are performed under contracts which do not expire until May 2019, and the company believes that these contracts will be similarly extended during the procurement process. These contracts may be subject to the same requirement of awarding to a SDVOSB prime contractor. Further, the Company's contract with HHS in support of its Head Start program generated 28% and 28% of our revenue for the fiscal quarters ended December 31, 2018 and 2017, respectively. This contract is on a time and materials basis and consists of a base period of four option periods for a total term of five years through April 2020. The Company's Danya subsidiary has provided these similar services to HHS since 19999. Danya was acquired by the Company in May 2016. The Company's results of operations, cash flows and financial condition would be materially adversely affected in the event that we were unable to continue our relationship with VA or HHS, or if the amount of services we provide to them was materially reduced. Given the uncertainty regarding both the outcome and the timing of the VA RFP discussed above, the Company has not reflected any current impact to its financial statements from this event.

Business Overview

DLH is a full-service provider of technology-enabled health and readiness enhancement services to government agencies including the Department of Veteran Affairs ("VA"), Department of Health and Human Services ("HHS"), Department of Defense ("DoD"), and other government agencies. DLH Holdings Corp. (together with its subsidiaries, "DLH" or the "Company" and also referred to as "we," "us" and "our") manages its operations from its principal executive offices in Atlanta, Georgia. We have complementary headquarters offices in Silver Spring, Maryland. We employ over 1,600 skilled employees working in more than 30 locations throughout the United States.

Presently, the Company derives 100% of its revenue from agencies of the federal government, primarily as a prime contractor but also as a subcontractor to other Federal prime contractors. A major customer is defined as a customer from whom the Company derives at least 10% of its revenues.

Our largest customer continues to be the VA, which comprised approximately 68% and 66% of revenue for the three months ended December 31, 2018 and 2017, respectively. Additionally, HHS, which comprised approximately 30% and 32% of revenue for the three months ended December 31, 2018 and 2017, respectively, represents a major customer. Our current contracts are within the following markets: Defense/VA (69%), Human Services and Solutions (29%) and Public Health/Life Sciences (2%); of which 97% of these contracts have been awarded on a Time and Materials basis, 2% are Cost Plus Fixed Fee contracts and 1% are Firm Fixed Price contracts. For additional information, see Note 4, Revenue Recognition.

In addition, substantially all accounts receivable, including contract assets, are from agencies of the U.S. Government as of December 31, 2018 and September 30, 2018. We generally operate as a prime contractor, but have also entered into contracts as a subcontractor. The Company's current business base is 99% prime contracts and 1% subcontracts. We believe that the credit risk associated with our receivables is limited due to the creditworthiness of these customers. See Note 5, Supporting Financial Information-Accounts Receivable.

The VA comprised approximately 68% and 66% of revenue for the three months ended December 31, 2018 and 2017, which was derived from 16 separate contracts related to its performance of pharmacy and logistics services in support of the VA's consolidated mail outpatient pharmacy program. Approximately 58% of the Company's current business base with the VA is derived from nine contracts (for pharmacy services), which are currently operating under extensions through April 30, 2019 pending completion of the procurement process for a new contract. We believe further extensions are possible until the procurement is completed. A single renewal request for proposal ("RFP") has currently been issued for these contracts that requires the prime contractor be a service-disabled veteran owned small business (SDVOSB), which precludes the Company from bidding on the RFP as a prime contractor. The Company has joined an SDVOSB team as a subcontractor to respond to this RFP. Should the contract be awarded to an SDVOSB partner of DLH, the Company expects to continue to perform a significant amount of the contract's volume of business. The remaining seven contracts for logistics services to the VA are performed under contracts which do not expire until May 2019, and the company believes that these contracts will be similarly extended during the procurement process. These contracts may be subject to the same requirement of awarding to a SDVOSB prime contractor.

Further, the Company's contract with HHS in support of its Head Start program generated 28% and 28% of our revenue for the fiscal quarters ended December 31, 2018 and 2017, respectively. This contract is on a time and materials basis and consists of a base period of four option periods for a total term of five years through April 2020. The Company's Danya subsidiary has provided these similar services to HHS since 19999. Danya was acquired by the Company in May 2016.

The Company's results of operations, cash flows and financial condition would be materially adversely affected in the event that we were unable to continue our relationship with VA or HHS, or if the amount of services we provide to them was materially reduced. Given the uncertainty regarding both the outcome and the timing of the VA RFP discussed above, the Company has not reflected any current impact to its financial statements from this event.