DEI Document - shares	9 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
DEI [Abstract]
Entity Registrant Name	IES Holdings, Inc.
Entity Central Index Key	0001048268
Document Type	10-Q
Document Period End Date	Jun. 30, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		21,216,036
Entity Current Reporting Status	Yes
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false