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Cover - USD ($)
 12 Months Ended
Sep. 30, 2021
Dec. 03, 2021
Mar. 31, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2021    
Document Transition Report false    
Entity File Number 0-18492    
Entity Registrant Name DLH HOLDINGS CORP.    
Entity Incorporation, State or Country Code NJ    
Entity Tax Identification Number 22-1899798    
Entity Address, Address Line One 3565 Piedmont Road,    
Entity Address, Address Line Two Building 3,    
Entity Address, Address Line Three Suite 700    
Entity Address, City or Town Atlanta,    
Entity Address, State or Province GA    
Entity Address, Postal Zip Code 30305    
City Area Code 770    
Local Phone Number 554-3545    
Title of 12(b) Security Common Stock    
Trading Symbol DLHC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 54,418,928
Entity Common Stock, Shares Outstanding   12,714,269  
Documents Incorporated by Reference
List hereunder the following documents if incorporated by reference and the Part of the Form 10-K (e.g., Part I, Part II, etc.) into which the document is incorporated: (1) Any annual report to security holders; (2) Any proxy or information statement; and (3) Any prospectus filed pursuant to Rule 424(b) or (e) under the Securities Act of 1933.
Part III of this report incorporates information by reference from the Company's definitive proxy statement, which proxy statement is due to be filed with the Securities and Exchange Commission not later than 120 days after September 30, 2021.
    
Current Fiscal Year End Date --09-30    
Entity Central Index Key 0000785557    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY