GOODWILL AND INTANGIBLE ASSETS - Intangible Assets, net by major class (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Finite-Lived intangible assets
Carrying Amount, Gross	$ 379,889	$ 378,951
Accumulated Amortization	(139,692)	(104,555)
Totals	240,197	274,396
Customer relationships
Finite-Lived intangible assets
Carrying Amount, Gross	318,507	317,672
Accumulated Amortization	(110,787)	(82,683)
Totals	207,720	234,989
Intellectual property
Finite-Lived intangible assets
Carrying Amount, Gross	56,546	56,442
Accumulated Amortization	(25,227)	(18,718)
Totals	31,319	37,724
Other
Finite-Lived intangible assets
Carrying Amount, Gross	4,836	4,837
Accumulated Amortization	(3,678)	(3,154)
Totals	$ 1,158	$ 1,683