Intangible Assets Including Goodwill - Carrying Value of Goodwill By Segment (Details) - USD ($) $ in Thousands		9 Months Ended
		Mar. 31, 2016	Feb. 01, 2016	Jun. 30, 2015
Goodwill [Line Items]
Goodwill				$ 96,518
Cumulative impairment loss	[1]			(25,000)
Goodwill		$ 71,518		71,518
Goodwill [Roll Forward]
Net balance at June 30, 2015		71,518
Goodwill, Acquired During Period		7,618
Translation adjustment	[2]	(291)
Net balance at March 31, 2016		78,845
Electrical Infrastructure [Member]
Goodwill [Line Items]
Goodwill				60,027
Cumulative impairment loss	[1]			(17,653)
Goodwill		42,374		42,374
Goodwill [Roll Forward]
Net balance at June 30, 2015		42,374
Goodwill, Acquired During Period		0
Translation adjustment	[2]	(240)
Net balance at March 31, 2016		42,134
Oil Gas & Chemical [Member]
Goodwill [Line Items]
Goodwill				17,008
Cumulative impairment loss	[1]			(3,000)
Goodwill		14,008		14,008
Goodwill [Roll Forward]
Net balance at June 30, 2015		14,008
Goodwill, Acquired During Period		0
Translation adjustment		0
Net balance at March 31, 2016		14,008
Storage Solutions [Member]
Goodwill [Line Items]
Goodwill				10,586
Cumulative impairment loss	[1]			(922)
Goodwill		9,664		9,664
Goodwill [Roll Forward]
Net balance at June 30, 2015		9,664
Translation adjustment	[2]	(6)
Net balance at March 31, 2016		17,276
Industrial [Member]
Goodwill [Line Items]
Goodwill				8,897
Cumulative impairment loss	[1]			(3,425)
Goodwill		5,472		$ 5,472
Goodwill [Roll Forward]
Net balance at June 30, 2015		5,472
Goodwill, Acquired During Period		0
Translation adjustment	[2]	(45)
Net balance at March 31, 2016		$ 5,427
Baillie Tank Equipment, Ltd. [Member]
Goodwill [Line Items]
Goodwill			$ 7,618

[1] A $25.0 million impairment charge was recorded in February 2005.

[2] The translation adjustments relate to the periodic translation of Canadian Dollar and South Korean Won denominated goodwill recorded as a part of prior acquisitions in Canada and South Korea, in which the local currency was determined to be the functional currency.