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Intangible Assets Including Goodwill - Carrying Value of Goodwill By Segment (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | May 31, 2017 | Dec. 12, 2016
Goodwill [Line Items] |  |  |
Goodwill | $ 113,501 |  |
Goodwill [Roll Forward] |  |  |
Net balance at June 30, 2015 | 113,501 |  |
Translation adjustment | 344 |  |
Net balance at September 30, 2017 | 113,845 |  |
Electrical Infrastructure [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 42,152 |  |
Goodwill [Roll Forward] |  |  |
Net balance at June 30, 2015 | 42,152 |  |
Translation adjustment | 184 |  |
Net balance at September 30, 2017 | 42,336 |  |
Oil Gas & Chemical [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 33,604 |  |
Goodwill [Roll Forward] |  |  |
Net balance at June 30, 2015 | 33,604 |  |
Translation adjustment | 0 |  |
Net balance at September 30, 2017 | 33,604 |  |
Storage Solutions [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 16,764 |  |
Goodwill [Roll Forward] |  |  |
Net balance at June 30, 2015 | 16,764 |  |
Translation adjustment | 126 |  |
Net balance at September 30, 2017 | 16,890 |  |
Industrial [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 20,981 |  |
Goodwill [Roll Forward] |  |  |
Net balance at June 30, 2015 | 20,981 |  |
Translation adjustment | 34 |  |
Net balance at September 30, 2017 | $ 21,015 |  |
Reporting Unit [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | $ 8,000 |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  | 9.00% |
Houston Interests, LLC [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  |  | $ 35,146

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- 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 -Subparagraph (a) -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits 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 (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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