SEGMENT AND GEOGRAPHIC INFORMATION - Operating Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
SEGMENT INFORMATION
Identifiable assets:	$ 962,900	$ 321,856
Goodwill, net:	157,825	51,927
Depreciation and amortization:	49,324	6,268
Capital expenditures:	36,300	12,472
Services Segment
SEGMENT INFORMATION
Identifiable assets:		161,805
Goodwill, net:		51,927
Depreciation and amortization:		5,320
Capital expenditures:		12,241
Products Segment
SEGMENT INFORMATION
Identifiable assets:		1,772
Depreciation and amortization:		34
Capital expenditures:		28
Unallocated Corporate Segment
SEGMENT INFORMATION
Identifiable assets:		158,279
Depreciation and amortization:		914
Capital expenditures:		$ 203
Discovery and Safety Assessment Segment (DSA)
SEGMENT INFORMATION
Identifiable assets:	280,308
Depreciation and amortization:	13,553
Capital expenditures:	16,224
Research Models And Services Segment (RMS)
SEGMENT INFORMATION
Identifiable assets:	682,592
Depreciation and amortization:	35,771
Capital expenditures:	$ 20,076