Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Jun. 30, 2023 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Revenue	$ 175,042	$ 193,840	$ 372,701	$ 402,271
Gross profit (loss)	10,589	(1,302)	22,448	11,706
Selling, general and administrative expenses	15,731	17,545	32,844	34,356
Goodwill impairment & restructuring costs	0	13,594	0	14,881
Operating income (loss)	(5,142)	(32,441)	(10,396)	(37,531)
Segment assets	404,834		404,834		$ 400,504
Storage and Terminal Solutions
Segment Reporting Information [Line Items]
Revenue	62,360	62,516	152,504	139,449
Gross profit (loss)	1,838	1,648	6,790	9,213
Selling, general and administrative expenses	4,338	5,450	8,967	9,608
Goodwill impairment & restructuring costs	0	383	0	906
Operating income (loss)	(2,500)	(4,185)	(2,177)	(1,301)
Segment assets	161,409		161,409		139,333
Utility and Power Infrastructure
Segment Reporting Information [Line Items]
Revenue	40,144	50,535	72,539	95,405
Gross profit (loss)	1,415	2,426	5,111	4,139
Selling, general and administrative expenses	1,978	1,787	3,526	3,525
Goodwill impairment & restructuring costs	0	0	0	37
Operating income (loss)	(563)	639	1,585	577
Segment assets	66,501		66,501		67,630
Process and Industrial Facilities
Segment Reporting Information [Line Items]
Revenue	71,305	80,789	146,425	167,417
Gross profit (loss)	6,671	(5,131)	11,749	(801)
Selling, general and administrative expenses	2,206	3,682	5,293	7,752
Goodwill impairment & restructuring costs	0	12,698	0	13,012
Operating income (loss)	4,465	(21,511)	6,456	(21,565)
Segment assets	92,688		92,688		90,514
Corporate
Segment Reporting Information [Line Items]
Revenue	1,233	0	1,233	0
Gross profit (loss)	665	(245)	(1,202)	(845)
Selling, general and administrative expenses	7,209	6,626	15,058	13,471
Goodwill impairment & restructuring costs	0	513	0	926
Operating income (loss)	(6,544)	(7,384)	(16,260)	(15,242)
Segment assets	84,236		84,236		$ 103,027
Operating Segments
Segment Reporting Information [Line Items]
Revenue	175,977	194,508	374,489	403,405
Operating Segments | Storage and Terminal Solutions
Segment Reporting Information [Line Items]
Revenue	63,074	63,130	154,053	140,420
Operating Segments | Utility and Power Infrastructure
Segment Reporting Information [Line Items]
Revenue	40,144	50,589	72,539	95,459
Operating Segments | Process and Industrial Facilities
Segment Reporting Information [Line Items]
Revenue	71,526	80,789	146,664	167,526
Operating Segments | Corporate
Segment Reporting Information [Line Items]
Revenue	1,233	0	1,233	0
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	935	668	1,788	1,134
Intersegment Eliminations | Storage and Terminal Solutions
Segment Reporting Information [Line Items]
Revenue	714	614	1,549	971
Intersegment Eliminations | Utility and Power Infrastructure
Segment Reporting Information [Line Items]
Revenue	0	54	0	54
Intersegment Eliminations | Process and Industrial Facilities
Segment Reporting Information [Line Items]
Revenue	221	0	239	109
Intersegment Eliminations | Corporate
Segment Reporting Information [Line Items]
Revenue	$ 0	$ 0	$ 0	$ 0