Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
Segment Reporting Information [Line Items]
Gross revenues	$ 250,452	$ 360,188	$ 910,636	$ 1,022,052
Revenue	248,327	358,887	905,101	1,017,966
Gross profit (loss)	20,477	36,906	82,943	88,213
Intangible asset impairments and restructuring costs	6,559	0	45,074	0
Operating income	(5,800)	12,794	(28,705)	20,541
Segment assets	567,347		567,347		$ 633,394
Electrical Infrastructure [Member]
Segment Reporting Information [Line Items]
Gross revenues	28,411	60,669	89,973	163,543
Revenue	28,411	60,669	89,973	163,543
Gross profit (loss)	752	6,210	(2,024)	13,155
Intangible asset impairments and restructuring costs	1,114	0	26,014	0
Operating income	(2,259)	2,882	(33,766)	3,977
Segment assets	97,747		97,747		155,880
Oil Gas & Chemical [Member]
Segment Reporting Information [Line Items]
Gross revenues	53,539	83,414	167,821	246,497
Revenue	52,313	82,544	165,835	244,322
Gross profit (loss)	2,946	10,736	10,778	25,518
Intangible asset impairments and restructuring costs	1,409	0	1,409	0
Operating income	(2,712)	4,796	(5,757)	8,895
Segment assets	86,194		86,194		91,959
Storage Solutions [Member]
Segment Reporting Information [Line Items]
Gross revenues	144,460	134,822	439,246	374,787
Revenue	143,746	134,391	436,582	372,876
Gross profit (loss)	18,010	14,575	58,840	35,275
Intangible asset impairments and restructuring costs	1,000	0	1,000	0
Operating income	6,479	3,730	24,830	5,371
Segment assets	228,717		228,717		188,912
Industrial [Member]
Segment Reporting Information [Line Items]
Gross revenues	24,042	81,283	213,596	237,225
Revenue	23,857	81,283	212,711	237,225
Gross profit (loss)	(1,231)	5,385	15,349	14,265
Intangible asset impairments and restructuring costs	3,036	0	16,651	0
Operating income	(7,308)	1,386	(14,012)	2,298
Segment assets	30,859		30,859		90,336
Other Segments [Member]
Segment Reporting Information [Line Items]
Segment assets	123,830		123,830		$ 106,307
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Gross revenues	2,125	1,301	5,535	4,086
Intersegment Eliminations [Member] | Oil Gas & Chemical [Member]
Segment Reporting Information [Line Items]
Gross revenues	1,226	870	1,986	2,175
Intersegment Eliminations [Member] | Storage Solutions [Member]
Segment Reporting Information [Line Items]
Gross revenues	714	431	2,664	1,911
Intersegment Eliminations [Member] | Industrial [Member]
Segment Reporting Information [Line Items]
Gross revenues	$ 185	$ 0	$ 885	$ 0