Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2022
Segment Reporting Information [Line Items]
Gross revenues	$ 188,601	$ 178,381	$ 592,006	$ 513,505
Revenue	186,895	177,003	589,166	507,061
Gross profit (loss)	4,419	(1,763)	16,125	(2,064)
Selling, general and administrative expenses	16,862	17,041	51,218	49,592
Goodwill impairment and restructuring costs	316	16,734	15,197	18,034
Operating loss	(12,759)	(35,538)	(50,290)	(69,690)
Segment assets	425,947		425,947		$ 440,793
Utility and Power Infrastructure
Segment Reporting Information [Line Items]
Gross revenues	35,024	59,341	130,483	171,298
Revenue	35,024	59,341	130,429	171,298
Gross profit (loss)	2,790	(492)	6,929	(7,089)
Selling, general and administrative expenses	1,869	2,910	5,394	9,109
Goodwill impairment and restructuring costs	0	2,659	37	2,705
Operating loss	921	(6,061)	1,498	(18,903)
Segment assets	77,211		77,211		94,059
Process and Industrial Facilities
Segment Reporting Information [Line Items]
Gross revenues	99,706	69,786	267,232	167,033
Revenue	99,706	68,971	267,123	163,192
Gross profit (loss)	3,160	(441)	2,359	6,663
Selling, general and administrative expenses	3,556	3,198	11,308	8,752
Goodwill impairment and restructuring costs	106	6,856	13,119	6,839
Operating loss	(502)	(10,495)	(22,068)	(8,928)
Segment assets	124,979		124,979		104,078
Storage and Terminal Solutions
Segment Reporting Information [Line Items]
Gross revenues	53,871	49,254	194,291	175,174
Revenue	52,165	48,691	191,614	172,571
Gross profit (loss)	(810)	(458)	8,403	(216)
Selling, general and administrative expenses	5,735	4,063	15,342	12,850
Goodwill impairment and restructuring costs	79	7,219	984	7,293
Operating loss	(6,624)	(11,740)	(7,923)	(20,359)
Segment assets	141,263		141,263		141,084
Corporate
Segment Reporting Information [Line Items]
Gross profit (loss)	(721)	(372)	(1,566)	(1,422)
Selling, general and administrative expenses	5,702	6,870	19,174	18,881
Goodwill impairment and restructuring costs	131	0	1,057	1,197
Operating loss	(6,554)	(7,242)	(21,797)	(21,500)
Segment assets	82,494		82,494		$ 101,572
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Gross revenues	1,706	1,378	2,840	6,444
Intersegment Eliminations [Member] | Utility and Power Infrastructure
Segment Reporting Information [Line Items]
Gross revenues	0	0	54	0
Intersegment Eliminations [Member] | Process and Industrial Facilities
Segment Reporting Information [Line Items]
Gross revenues	0	815	109	3,841
Intersegment Eliminations [Member] | Storage and Terminal Solutions
Segment Reporting Information [Line Items]
Gross revenues	$ 1,706	$ 563	$ 2,677	$ 2,603