SEGMENT AND GEOGRAPHIC INFORMATION - Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Sep. 30, 2025
SEGMENT INFORMATION
Revenue	$ 120,879	$ 119,876
Long-lived assets	179,099		$ 180,726
United States
SEGMENT INFORMATION
Revenue	103,709	97,399
Long-lived assets	159,112		160,343
Netherlands
SEGMENT INFORMATION
Revenue	9,938	15,834
Long-lived assets	6,902		7,038
Other
SEGMENT INFORMATION
Revenue	7,232	$ 6,643
Long-lived assets	$ 13,085		$ 13,345