Annual report [Section 13 and 15(d), not S-K Item 405]

Goodwill - Schedule of Company's goodwill (Details)

v3.25.3
Goodwill - Schedule of Company's goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Goodwill [Roll Forward]    
Goodwill, Beginning Balance $ 61,152 $ 75,866
Acquisition   3,000
Goodwill adjustments   347
Goodwill impairment 0 (18,056)
Goodwill, Ending Balance 61,152 61,152
CRO acquisition    
Goodwill [Roll Forward]    
Acquisition   89
Central Steel acquisition    
Goodwill [Roll Forward]    
Acquisition   2,906
Revenue    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 36,947 36,947
Goodwill adjustments   0
Goodwill impairment   0
Goodwill, Ending Balance 36,947 36,947
Revenue | CRO acquisition    
Goodwill [Roll Forward]    
Acquisition   0
Revenue | Central Steel acquisition    
Goodwill [Roll Forward]    
Acquisition   0
Cost of revenue    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 13,451 30,419
Goodwill adjustments   999
Goodwill impairment   (18,056)
Goodwill, Ending Balance 13,451 13,451
Cost of revenue | CRO acquisition    
Goodwill [Roll Forward]    
Acquisition   89
Cost of revenue | Central Steel acquisition    
Goodwill [Roll Forward]    
Acquisition   0
Gross profit    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 807 807
Goodwill adjustments   0
Goodwill impairment   0
Goodwill, Ending Balance 807 807
Gross profit | CRO acquisition    
Goodwill [Roll Forward]    
Acquisition   0
Gross profit | Central Steel acquisition    
Goodwill [Roll Forward]    
Acquisition   0
Gross profit percentage    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 9,947 7,693
Goodwill adjustments   (652)
Goodwill impairment   0
Goodwill, Ending Balance 9,947 9,947
Gross profit percentage | CRO acquisition    
Goodwill [Roll Forward]    
Acquisition   0
Gross profit percentage | Central Steel acquisition    
Goodwill [Roll Forward]    
Acquisition   2,906
General and administrative expenses    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 0 0
Goodwill adjustments   0
Goodwill impairment   0
Goodwill, Ending Balance $ 0 0
General and administrative expenses | CRO acquisition    
Goodwill [Roll Forward]    
Acquisition   0
General and administrative expenses | Central Steel acquisition    
Goodwill [Roll Forward]    
Acquisition   $ 0