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GOODWILL AND INTANGIBLE ASSETS - Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Sep. 30, 2022
Goodwill |  |  |  |  |
Gross Carrying Amount | $ 396,658 |  | $ 396,658 |  | $ 393,830
Acquisition during the period |  |  | 2,828 |  |
Goodwill impairment | 0 | $ 0 | (66,367) | $ 0 |
Goodwill | 94,286 |  | 94,286 |  | 157,825
DSA |  |  |  |  |
Goodwill |  |  |  |  |
Gross Carrying Amount | 94,286 |  | 94,286 |  | 91,458
Acquisition during the period |  |  | 2,828 |  |
RMS |  |  |  |  |
Goodwill |  |  |  |  |
Gross Carrying Amount | 302,372 |  | 302,372 |  | 302,372
Goodwill impairment |  |  | (66,367) |  |
Accumulated impairment loss | $ (302,372) |  | $ (302,372) |  | $ (236,005)

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