Business Overview	9 Months Ended
Jun. 30, 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 1,500 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 64% and 58% of revenue for the nine months ended June 30, 2018 and 2017, respectively. Additionally, HHS, which comprised approximately 34% and 32% of revenue for the nine months ended June 30, 2018 and 2017, respectively, represents a major customer. Our current contracts are within the following markets: Defense/VA (65%), Human Services and Solutions (32%) and Public Health/Life Sciences (3%); 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. In addition, substantially all accounts receivable, including unbilled accounts receivable, are from agencies of the U.S. Government as of June 30, 2018 and September 30, 2017. 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 4, Supporting Financial Information-Accounts Receivable. As of June 30, 2018, awards from VA and HHS have anticipated periods of performance ranging from approximately four months to up to two years. 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. The VA comprised approximately 64% and 58% of revenue for the nine months ended June 30, 2018 and 2017, which was derived from 16 separate contracts. Approximately 55% of the Company's current business base with the VA is derived from nine contracts which are currently operating under extensions through October 31, 2018. We expect further extensions 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 teamed 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 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 1,500 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 64% and 58% of revenue for the nine months ended June 30, 2018 and 2017, respectively. Additionally, HHS, which comprised approximately 34% and 32% of revenue for the nine months ended June 30, 2018 and 2017, respectively, represents a major customer. Our current contracts are within the following markets: Defense/VA (65%), Human Services and Solutions (32%) and Public Health/Life Sciences (3%); 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. In addition, substantially all accounts receivable, including unbilled accounts receivable, are from agencies of the U.S. Government as of June 30, 2018 and September 30, 2017. 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 4, Supporting Financial Information-Accounts Receivable.

As of June 30, 2018, awards from VA and HHS have anticipated periods of performance ranging from approximately four months to up to two years. 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.

The VA comprised approximately 64% and 58% of revenue for the nine months ended June 30, 2018 and 2017, which was derived from 16 separate contracts. Approximately 55% of the Company's current business base with the VA is derived from nine contracts which are currently operating under extensions through October 31, 2018. We expect further extensions 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 teamed 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 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.