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Per Share Information EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Continuing operations
Net Income (Loss) from Available to Common Stockholders, Basic									$ 119,722	$ 16,792	$ 5,500
ContinuingNetIncomeLossAvailableToCommonStockholdersDiluted									1,056	85	22
Income (Loss) from Continuing Operations Attributable to Parent									120,778	16,877	5,522
Discontinued operations
DiscontinuedNetIncomeLossAvailableToCommonStockholdersBasic									0	(339)	(198)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									0	(339)	(198)
Net Income (Loss) Available to Common Stockholders									119,722	16,453	5,302
Net income (loss) attributable to restricted shareholders									1,056	85	22
Net Income Attributable to IES Holdings	$ 101,980	$ 10,805	$ 2,194	$ 5,799					$ 120,778	$ 16,538	$ 5,324
Weighted Average Number of Shares Outstanding, Basic									21,279,342	21,480,622	18,417,564
Incremental Common Shares Attributable to Share-based Payment Arrangements									212,997	45,566	55,856
Weighted Average Number of Shares Outstanding, Diluted, Total									21,492,339	21,526,188	18,473,420
Earnings Per Share, Basic [Abstract]
Continuing operations					$ 0.36	$ 0.19	$ 0.08	$ 0.16	$ 5.63	$ 0.79	$ 0.3
Discontinued operations					(0.01)	0	0	(0.01)	0	(0.02)	(0.01)
Earnings Per Share, Basic	$ 4.75	$ 0.5	$ 0.1	$ 0.27	0.35	0.19	0.08	0.15	5.63	0.77	0.29
Earnings Per Share, Diluted [Abstract]
Continuing operations					0.36	0.19	0.08	0.16	5.62	0.79	0.3
Discontinued operations					(0.01)	0	0	(0.01)	0	(0.02)	(0.01)
Earnings Per Share, Diluted	$ 4.74	$ 0.5	$ 0.1	$ 0.27	$ 0.35	$ 0.19	$ 0.08	$ 0.15	$ 5.62	$ 0.77	$ 0.29

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration