Business Overview	3 Months Ended
Dec. 31, 2017
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 complimentary headquarters offices in Silver Spring, Maryland. We employ over 1,400 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 66% and 61% of revenue for the three months ended December 31, 2017 and 2016, respectively. Additionally, HHS represents a major customer, comprising 32% of revenue for the three months ended December 31, 2017 and 29% for the three months ended December 31, 2016. In addition, substantially all accounts receivable, including unbilled accounts receivable, are from agencies of the U.S. Government as of December 31, 2017 and September 30, 2017. 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. As of December 31, 2017, awards from VA and HHS have anticipated periods of performance ranging from approximately one 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 contract term. 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.

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 complimentary headquarters offices in Silver Spring, Maryland. We employ over 1,400 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 66% and 61% of revenue for the three months ended December 31, 2017 and 2016, respectively. Additionally, HHS represents a major customer, comprising 32% of revenue for the three months ended December 31, 2017 and 29% for the three months ended December 31, 2016. In addition, substantially all accounts receivable, including unbilled accounts receivable, are from agencies of the U.S. Government as of December 31, 2017 and September 30, 2017. 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.

As of December 31, 2017, awards from VA and HHS have anticipated periods of performance ranging from approximately one 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 contract term. 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.