XML 95 R74.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Goodwill and Intangible Assets - Goodwill RollForward (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015
GoodwillRollForward |  |
Goodwill, Beginning Balance | $ 17,249 | $ 14,993
Acquisitions | 23,264 | 2,256
Divestitures | 577 |
Goodwill, Ending Balance | 39,936 | 17,249
Residential [Member] |  |
GoodwillRollForward |  |
Goodwill, Beginning Balance | 8,631 | 8,631
Acquisitions | 0 | 0
Goodwill, Ending Balance | 8,631 | 8,631
Commercial & Industrial [Member] |  |
GoodwillRollForward |  |
Goodwill, Beginning Balance | 0 | 0
Acquisitions | 3,806 | 0
Goodwill, Ending Balance | 3,806 | 0
Infrastructure Solutions [Member] |  |
GoodwillRollForward |  |
Goodwill, Beginning Balance | 8,618 | 6,362
Acquisitions | 19,458 | 2,256
Divestitures | 577 |
Goodwill, Ending Balance | $ 27,499 | $ 8,618

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_GoodwillRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=iesc_ResidentialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=iesc_CommercialIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=iesc_MiscorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |