Basis of Presentation and Principles of Consolidation	9 Months Ended
Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying consolidated financial statements include the accounts of DLH Holdings Corp. and its wholly-owned subsidiaries ("DLH" or the "Company" and also referred to as "we," "us" and "our"). All significant intercompany balances and transactions have been eliminated in consolidation. The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these statements do not include all of the information and footnotes required by GAAP for complete financial statements. Certain prior year amounts have been reclassified to conform to the fiscal 2026 presentation. These reclassifications had no impact on the Company's reported total revenues, expenses, net income, current assets, total assets, current liabilities, total liabilities, stockholders' equity, or cash flows. No reclassifications of prior period balances were material to the unaudited consolidated financial statements. Operating results for the nine months ended June 30, 2026 are not necessarily indicative of the results that may be expected for the year ending September 30, 2026 or any future period. Amounts as of June 30, 2026 and for the three and nine months ended June 30, 2026 are unaudited. For further information, refer to the consolidated financial statements and footnotes thereto included in the Company's Annual Report on Form 10-K for the year ended September 30, 2025 filed with the Securities and Exchange Commission on December 10, 2025.

Basis of Presentation and Principles of Consolidation

9 Months Ended

Jun. 30, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Principles of Consolidation

The accompanying consolidated financial statements include the accounts of DLH Holdings Corp. and its wholly-owned subsidiaries ("DLH" or the "Company" and also referred to as "we," "us" and "our"). All significant intercompany balances and transactions have been eliminated in consolidation. The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these statements do not include all of the information and footnotes required by GAAP for complete financial statements. Certain prior year amounts have been reclassified to conform to the fiscal 2026 presentation. These reclassifications had no impact on the Company's reported total revenues, expenses, net income, current assets, total assets, current liabilities, total liabilities, stockholders' equity, or cash flows. No reclassifications of prior period balances were material to the unaudited consolidated financial statements.

Operating results for the nine months ended June 30, 2026 are not necessarily indicative of the results that may be expected for the year ending September 30, 2026 or any future period. Amounts as of June 30, 2026 and for the three and nine months ended June 30, 2026 are unaudited. For further information, refer to the consolidated financial statements and footnotes thereto included in the Company's Annual Report on Form 10-K for the year ended September 30, 2025 filed with the Securities and Exchange Commission on December 10, 2025.