Document and Entity Information - shares	3 Months Ended
	Dec. 31, 2019	Jan. 31, 2020
Document and Entity Information
Entity Registrant Name	DLH Holdings Corp.
Entity Central Index Key	0000785557
Document Type	10-Q
Document Period End Date	Dec. 31, 2019
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--09-30
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding		12,355,006