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SEGMENT AND GEOGRAPHIC INFORMATION - Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
SEGMENT INFORMATION |  |  |  |
Depreciation and amortization: | $ 12,990 | $ 9,831 | $ 26,253 | $ 15,866
Capital expenditures: | 8,471 | 9,547 | 16,840 | 15,202
Discovery and Safety Assessment Segment (DSA) |  |  |  |
SEGMENT INFORMATION |  |  |  |
Depreciation and amortization: | 3,611 | 3,414 | 7,591 | 5,958
Capital expenditures: | 3,970 | 3,431 | 7,264 | 6,417
Research Models And Services Segment (RMS) |  |  |  |
SEGMENT INFORMATION |  |  |  |
Depreciation and amortization: | 9,379 | 6,417 | 18,662 | 9,908
Capital expenditures: | $ 4,501 | $ 6,116 | $ 9,576 | $ 8,785

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