Business Overview	12 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Overview	Business Overview At present, 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. Our current contracts are within the following markets: Defense/VA (65%), Human Services and Solutions (31%) and Public Health/Life Sciences (4%); of which 95% of these contracts have been awarded on a Time and Materials basis, 3% are Cost plus Fixed Fee contracts and 2% are Firm Fixed Price contracts. In addition, substantially all accounts receivable, including unbilled accounts receivable, are from agencies of the U.S. Government as of September 30, 2018 and 2017. We believe that the credit risk associated with our receivables is limited due to the creditworthiness of these customers. The Company’s current business base is 99% prime contracts and 1% subcontracts. Our largest customer continues to be the VA, which comprised approximately 63% and 62% of revenue for the years ended September 30, 2018 and 2017, respectively. HHS, which comprised approximately 34% and 34% of revenue for the year ended September 30, 2018 and 2017, respectively, is also a major customer. These agreements are subject to the Federal Acquisition Regulations. While there can be no assurance as to the actual amount of services that the Company will ultimately provide to VA and HHS under its current contracts, we believe that our strong working relationships and our effective service delivery support ongoing performance for the terms of the contracts. Our results of operations, cash flows and financial condition would be materially adversely affected if we were unable to continue our relationship with either of these customers, or if the amount of services we provide to them was materially reduced. DLH’s revenues from the VA are 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 57% of the Company’s current business base with the VA is derived from nine contracts (for pharmacy services) that are currently operating under extensions through April 2019 pending completion of the procurement process for a new contract. A single renewal request for proposal (“RFP”) has currently been issued for these nine contracts and we expect further extensions until the procurement process is completed. The RFP, however, 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. We have 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. Our contract with HHS in support of its Head Start program generated 31% and 29% of our revenue from HHS for the fiscal years ended September 30, 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 1999. Danya was acquired by the Company in May 2016

Business Overview

At present, 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. Our current contracts are within the following markets: Defense/VA (65%), Human Services and Solutions (31%) and Public Health/Life Sciences (4%); of which 95% of these contracts have been awarded on a Time and Materials basis, 3% are Cost plus Fixed Fee contracts and 2% are Firm Fixed Price contracts. In addition, substantially all accounts receivable, including unbilled accounts receivable, are from agencies of the U.S. Government as of September 30, 2018 and 2017. We believe that the credit risk associated with our receivables is limited due to the creditworthiness of these customers. The Company’s current business base is 99% prime contracts and 1% subcontracts.

Our largest customer continues to be the VA, which comprised approximately 63% and 62% of revenue for the years ended September 30, 2018 and 2017, respectively. HHS, which comprised approximately 34% and 34% of revenue for the year ended September 30, 2018 and 2017, respectively, is also a major customer. These agreements are subject to the Federal Acquisition Regulations. While there can be no assurance as to the actual amount of services that the Company will ultimately provide to VA and HHS under its current contracts, we believe that our strong working relationships and our effective service delivery support ongoing performance for the terms of the contracts. Our results of operations, cash flows and financial condition would be materially adversely affected if we were unable to continue our relationship with either of these customers, or if the amount of services we provide to them was materially reduced.

DLH’s revenues from the VA are 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 57% of the Company’s current business base with the VA is derived from nine contracts (for pharmacy services) that are currently operating under extensions through April 2019 pending completion of the procurement process for a new contract. A single renewal request for proposal (“RFP”) has currently been issued for these nine contracts and we expect further extensions until the procurement process is completed. The RFP, however, 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. We have 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.

Our contract with HHS in support of its Head Start program generated 31% and 29% of our revenue from HHS for the fiscal years ended September 30, 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 1999. Danya was acquired by the Company in May 2016