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Cover - USD ($)
12 Months Ended
Sep. 30, 2024
Dec. 02, 2024
Mar. 31, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2024    
Current Fiscal Year End Date --09-30    
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 Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 113,389,085
Entity Common Stock, Shares Outstanding   14,386,468  
Documents Incorporated by Reference
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, 2024.
   
Entity Central Index Key 0000785557    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY