Document And Entity Information - shares	9 Months Ended
	Jun. 30, 2017	Aug. 03, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	IES Holdings, Inc.
Entity Central Index Key	0001048268
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		21,434,344
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
TradingSymbol	IESC