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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 54 Months Ended
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2022
Mar. 31, 2022
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2024
Segment Reporting Information [Line Items]                
Long-Lived Assets         $ 62,648 $ 69,344 $ 75,936 $ 62,648
Cost of revenue         (687,740) (764,200) (708,986)  
Restructuring costs         501 3,142 646 25,055
Revenue         728,213 795,020 707,780  
Gross profit (loss)         40,473 30,820 (1,206)  
Selling, general and administrative expenses         70,085 68,249 67,690  
Operating loss         (30,113) (52,887) (87,854)  
Goodwill impairment $ 12,300   $ 12,300     12,316 18,312  
Assets         451,351 400,504 440,793 451,351
UNITED STATES                
Segment Reporting Information [Line Items]                
Long-Lived Assets         57,520 63,174 69,932 57,520
Revenue         662,449 720,140 640,512  
CANADA                
Segment Reporting Information [Line Items]                
Long-Lived Assets         1,368 1,957 1,397 1,368
Revenue         56,420 61,691 63,045  
International [Member]                
Segment Reporting Information [Line Items]                
Long-Lived Assets         3,760 4,213 4,607 3,760
Utility and Power Infrastructure                
Segment Reporting Information [Line Items]                
Cost of revenue         (174,688) (158,805) (228,679)  
Restructuring costs         52      
Gross profit (loss)         9,232 10,699 (8,586)  
Goodwill impairment           0 2,659  
Process and Industrial Facilities                
Segment Reporting Information [Line Items]                
Cost of revenue         (244,408) (359,067) (245,578)  
Restructuring costs         215 972 (1,578)  
Revenue         266,260 369,823 254,848  
Gross profit (loss)         21,852 10,756 9,270  
Selling, general and administrative expenses         10,354 14,909 12,506  
Operating loss         11,283 (17,441) (10,103)  
Goodwill impairment           12,316 8,445  
Assets         81,524 90,514 104,078 81,524
Storage and Terminal Solutions                
Segment Reporting Information [Line Items]                
Cost of revenue         (265,503) (245,223) (232,577)  
Restructuring costs         0 969 122  
Revenue         276,800 255,693 232,839  
Gross profit (loss)         11,297 10,470 262  
Selling, general and administrative expenses         19,823 20,054 17,284  
Operating loss         (8,526) (10,553) (24,352)  
Goodwill impairment   $ (18,300)   $ 18,300   0 7,208  
Assets         138,529 139,333 141,084 138,529
Utility and Power Infrastructure Member                
Segment Reporting Information [Line Items]                
Restructuring costs           37 87  
Revenue         183,920 169,504 220,093  
Selling, general and administrative expenses         8,844 7,045 11,771  
Operating loss         336 3,617 (23,103)  
Assets         84,108 67,630 94,059 84,108
Corporate Segment                
Segment Reporting Information [Line Items]                
Cost of revenue         (3,141) (1,105) (2,152)  
Restructuring costs         234 1,164 2,015  
Revenue         1,233 0 0  
Gross profit (loss)         (1,908) (1,105) (2,152)  
Selling, general and administrative expenses         31,064 26,241 26,129  
Operating loss         (33,206) (28,510) (30,296)  
Goodwill impairment           0 0  
Assets         $ 147,190 $ 103,027 $ 101,572 $ 147,190