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SEGMENT AND GEOGRAPHIC INFORMATION - Operating Segments (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2022
SEGMENT INFORMATION      
Identifiable assets: $ 871,059   $ 962,900
Goodwill, net 91,458   $ 157,825
Depreciation and amortization: 13,263 $ 6,035  
Capital expenditures: 8,369 5,655  
Discovery and Safety Assessment Segment (DSA)      
SEGMENT INFORMATION      
Depreciation and amortization: 3,980 2,544  
Capital expenditures: 3,294 2,986  
Research Models And Services Segment (RMS)      
SEGMENT INFORMATION      
Depreciation and amortization: 9,283 3,491  
Capital expenditures: $ 5,075 $ 2,669