Intangible Assets Including Goodwill - Carrying Value of Goodwill By Segment (Details) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2020	Mar. 31, 2020
Goodwill [Line Items]
Goodwill	$ 60,277	$ 60,277
Amount of fair value in excess of carrying amount		14,100
Goodwill [Roll Forward]
Net balance at June 30, 2019	93,368
Goodwill impairment	(32,881)
Translation adjustment	(210)
Net balance at March 31, 2020	60,277
Electrical Infrastructure [Member]
Goodwill [Line Items]
Goodwill	0	0
Goodwill [Roll Forward]
Net balance at June 30, 2019	24,830
Goodwill impairment	(24,900)
Translation adjustment	70
Net balance at March 31, 2020	0
Oil Gas & Chemical [Member]
Goodwill [Line Items]
Goodwill	30,829	30,829
Goodwill [Roll Forward]
Net balance at June 30, 2019	30,829
Goodwill impairment	0
Translation adjustment	0
Net balance at March 31, 2020	30,829
Storage Solutions [Member]
Goodwill [Line Items]
Goodwill	16,489	16,489
Goodwill [Roll Forward]
Net balance at June 30, 2019	16,736
Goodwill impairment	0
Translation adjustment	(247)
Net balance at March 31, 2020	16,489
Industrial [Member]
Goodwill [Line Items]
Goodwill	12,959	$ 12,959
Goodwill [Roll Forward]
Net balance at June 30, 2019	20,973
Goodwill impairment	(7,981)
Translation adjustment	(33)
Net balance at March 31, 2020	$ 12,959