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SEGMENT AND GEOGRAPHIC INFORMATION - Geographic Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
SEGMENT INFORMATION      
Revenue $ 513,024 $ 490,739 $ 572,425
Long-lived assets 180,726 188,328  
United States      
SEGMENT INFORMATION      
Revenue 447,983 419,104 482,630
Long-lived assets 160,343 167,772  
Netherlands      
SEGMENT INFORMATION      
Revenue 35,479 44,694 54,088
Long-lived assets 7,038 7,159  
Other      
SEGMENT INFORMATION      
Revenue 29,562 26,941 $ 35,707
Long-lived assets $ 13,345 $ 13,397