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GOODWILL AND INTANGIBLE ASSETS - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Goodwill
Goodwill, Gross Carrying Amount	$ 393,830		$ 393,830
Goodwill impairment loss	66,367	$ 0
Goodwill, net	91,458		157,825
DSA
Goodwill
Goodwill, Gross Carrying Amount	91,458		91,458
RMS
Goodwill
Goodwill, Gross Carrying Amount	302,372		302,372
Goodwill impairment loss	66,367
Accumulated impairment loss	$ (302,372)		$ (236,005)

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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