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Operating expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Operating expenses    
Payroll and employee benefits $ 79,326 $ 78,905
Facilities 5,817 5,623
Billing 12,691 11,030
Professional fees 7,023 6,288
Outbound freight 5,618 5,466
Vehicle fuel and maintenance 4,736 4,675
Bank and credit card fees 2,287 2,121
Technology 1,972 1,592
Insurance 1,476 1,549
All other 4,511 5,293
Total operating expenses $ 125,457 $ 122,542