Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2021
Segment Reporting Information [Line Items]
Gross revenues	$ 178,381	$ 149,357	$ 513,505	$ 503,556
Revenue	177,003	148,260	507,061	498,499
Gross profit (loss)	(1,763)	1,560	(2,064)	31,223
Selling, general and administrative expenses	17,041	17,179	49,592	52,031
Goodwill impairment and restructuring costs	16,734	1,860	18,034	6,585
Operating loss	(35,538)	(17,479)	(69,690)	(27,393)
Segment assets	413,080		413,080		$ 467,556
Utility and Power Infrastructure
Segment Reporting Information [Line Items]
Gross revenues	59,341	44,720	171,298	157,414
Revenue	59,341	44,720	171,298	157,414
Gross profit (loss)	(492)	(4,692)	(7,089)	7,818
Selling, general and administrative expenses	2,910	2,356	9,109	7,154
Goodwill impairment and restructuring costs	2,659	403	2,705	1,226
Operating loss	(6,061)	(7,451)	(18,903)	(562)
Segment assets	108,071		108,071		81,717
Process and Industrial Facilities
Segment Reporting Information [Line Items]
Gross revenues	69,786	43,095	167,033	141,570
Revenue	68,971	42,834	163,192	140,027
Gross profit (loss)	(441)	(171)	6,663	11,352
Selling, general and administrative expenses	3,198	3,882	8,752	11,319
Goodwill impairment and restructuring costs	6,856	781	6,839	3,645
Operating loss	(10,495)	(4,834)	(8,928)	(3,612)
Segment assets	92,235		92,235		106,619
Storage and Terminal Solutions
Segment Reporting Information [Line Items]
Gross revenues	49,254	61,542	175,174	204,572
Revenue	48,691	60,706	172,571	201,058
Gross profit (loss)	(458)	6,423	(216)	12,053
Selling, general and administrative expenses	4,063	4,792	12,850	13,854
Goodwill impairment and restructuring costs	7,219	590	7,293	1,244
Operating loss	(11,740)	1,041	(20,359)	(3,045)
Segment assets	133,969		133,969		160,782
Corporate
Segment Reporting Information [Line Items]
Gross profit (loss)	(372)	0	(1,422)	0
Selling, general and administrative expenses	6,870	6,149	18,881	19,704
Goodwill impairment and restructuring costs	0	86	1,197	470
Operating loss	(7,242)	(6,235)	(21,500)	(20,174)
Segment assets	78,805		78,805		$ 118,438
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Gross revenues	1,378	1,097	6,444	5,057
Intersegment Eliminations [Member] | Process and Industrial Facilities
Segment Reporting Information [Line Items]
Gross revenues	815	261	3,841	1,543
Intersegment Eliminations [Member] | Storage and Terminal Solutions
Segment Reporting Information [Line Items]
Gross revenues	$ 563	$ 836	$ 2,603	$ 3,514