Intangible Assets Including Goodwill - Carrying Value of Goodwill By Segment (Details) $ in Thousands	6 Months Ended
	Dec. 31, 2018 USD ($)
Goodwill [Line Items]
Goodwill	$ 96,162
Goodwill [Roll Forward]
Net balance at June 30, 2015	96,162
Goodwill, Written off Related to Sale of Business Unit	(2,775)
Translation adjustment	(124)
Net balance at December 31, 2018	93,263
Electrical Infrastructure [Member]
Goodwill [Line Items]
Goodwill	24,826
Goodwill [Roll Forward]
Net balance at June 30, 2015	24,826
Goodwill, Written off Related to Sale of Business Unit	0
Translation adjustment	(43)
Net balance at December 31, 2018	24,783
Oil Gas & Chemical [Member]
Goodwill [Line Items]
Goodwill	33,604
Goodwill [Roll Forward]
Net balance at June 30, 2015	33,604
Goodwill, Written off Related to Sale of Business Unit	(2,775)
Translation adjustment	0
Net balance at December 31, 2018	30,829
Storage Solutions [Member]
Goodwill [Line Items]
Goodwill	16,760
Goodwill [Roll Forward]
Net balance at June 30, 2015	16,760
Goodwill, Written off Related to Sale of Business Unit	0
Translation adjustment	(73)
Net balance at December 31, 2018	16,687
Industrial [Member]
Goodwill [Line Items]
Goodwill	20,972
Goodwill [Roll Forward]
Net balance at June 30, 2015	20,972
Goodwill, Written off Related to Sale of Business Unit	0
Translation adjustment	(8)
Net balance at December 31, 2018	$ 20,964