Intangible Assets Including Goodwill - Carrying Value of Goodwill By Segment (Details) $ in Thousands	9 Months Ended
	Mar. 31, 2022 USD ($)
Goodwill [Line Items]
Goodwill	$ 42,240
Goodwill [Roll Forward]
Net balance at June 30, 2021	60,636
Goodwill impairment	(18,312)
Translation adjustment	(84)
Net balance at March 31, 2022	42,240
Utility and Power Infrastructure
Goodwill [Line Items]
Goodwill	4,298
Goodwill [Roll Forward]
Net balance at June 30, 2021	6,984
Goodwill impairment	(2,659)
Translation adjustment	(27)
Net balance at March 31, 2022	4,298
Process and Industrial Facilities
Goodwill [Line Items]
Goodwill	18,427
Goodwill [Roll Forward]
Net balance at June 30, 2021	26,878
Goodwill impairment	(8,445)
Translation adjustment	(6)
Net balance at March 31, 2022	18,427
Storage and Terminal Solutions
Goodwill [Line Items]
Goodwill	19,515
Goodwill [Roll Forward]
Net balance at June 30, 2021	26,774
Goodwill impairment	(7,208)
Translation adjustment	(51)
Net balance at March 31, 2022	$ 19,515