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GOODWILL AND INTANGIBLE ASSETS - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Goodwill
Goodwill gross, beginning balance			$ 393,830
Acquisitions			2,828
Impairment	$ 0	$ 0	(66,367)	$ 0
Goodwill gross, ending balance	396,658		396,658
Goodwill	94,286		94,286		$ 157,825
DSA
Goodwill
Goodwill gross, beginning balance			91,458
Acquisitions			2,828
Goodwill gross, ending balance	94,286		94,286
RMS
Goodwill
Goodwill gross, beginning balance			302,372
Impairment			(66,367)
Goodwill gross, ending balance	302,372		302,372
Accumulated impairment loss - RMS	$ (302,372)		$ (302,372)		$ (236,005)