| **Business Overview**                                                               | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
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| **Organization, Consolidation and Presentation of Financial Statements [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Business Overview                                                                   | Business Overview For more than 25 years, DLH Holdings Corp. ("DLH"), has provided professional services to the U.S. Government. Headquartered in Atlanta, Georgia, DLH employs over 1,200 skilled technicians, logisticians, engineers, healthcare and support personnel at more than 25 locations around the United States. DLH’s operating subsidiary, DLH Solutions, Inc., is organized into two broad integrated revenue streams: Healthcare Delivery Solutions and Logistics & Technical Services. Our customers, a majority of whom are within the Departments of Defense ("DoD") and Veterans Affairs ("DVA"), benefit from proven business process management processes, technical excellence and differentiation, and cost management. The remaining portion of DLH's business is comprised of customers within the Center for Disease Control and Prevention, Departments of Justice, Agriculture, Interior and Federal Emergency Management Agency, at locations throughout the United States.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 at 1776 Peachtree Street, Atlanta, Georgia 30309.Presently, the Company derives all of its revenue from agencies of the federal government. A major customer is defined as a customer from whom the Company derives at least 10% of its revenues. In each of the fiscal years ended September 30, 2014 and 2013, revenue from the U.S. Government accounted, either directly or indirectly, for 100% of the Company’s total revenue.  Within the U.S. Government, our largest customer continues to be the Department of Veterans Affairs (DVA), at 96% of revenue for the twelve months ended September 30, 2014 and 2013.  In addition, all accounts receivable, including unbilled accounts receivable, are from agencies of the U.S. Government as of September 30, 2014 and 2013.  We believe that the credit risk associated with our receivables is limited due to the credit worthiness of these customers.Accordingly, DLH remains dependent upon the continuation of its relationship with the DVA.  As of September 30, 2014, contracts with the DVA have anticipated periods of performance ranging from approximately two to up to four 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 the DVA under its current contract, we believe that our strong working relationship 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 relationships with the DVA. |

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| - Definition
The entire disclosure for the general note to the financial statements for the reporting entity which may include, descriptions of the basis of presentation, business description, significant accounting policies, consolidations, reclassifications, new pronouncements not yet adopted and changes in accounting principles.
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No definition available.
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