Intangible Assets Including Goodwill - Carrying Value of Goodwill By Segment (Details) - USD ($) $ in Thousands		6 Months Ended
		Dec. 31, 2015	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
Translation adjustment	[2]	(913)
Net balance at December 31, 2015		70,605
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
Translation adjustment	[2]	(595)
Net balance at December 31, 2015		41,779
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
Translation adjustment		0
Net balance at December 31, 2015		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]	(206)
Net balance at December 31, 2015		9,458
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
Translation adjustment	[2]	(112)
Net balance at December 31, 2015		$ 5,360

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

[2] The translation adjustments relate to the periodic translation of Canadian Dollar denominated goodwill recorded as a part of prior Canadian acquisition