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GOODWILL AND INTANGIBLE ASSETS - Goodwill Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Goodwill
Beginning balance	$ 94,286	$ 94,286	$ 157,825
Impairment	0	0	(66,367)
Ending balance	94,286	94,286	94,286
DSA
Goodwill
Acquisitions	0	0	2,828
RMS
Goodwill
Accumulated impairment loss after deducting foreign exchange	$ (302,220)	$ (302,220)	$ (302,220)

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