SEGMENT AND GEOGRAPHIC INFORMATION - Operating Segments Revenue and Operating Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
SEGMENT INFORMATION
Revenue	$ 119,876	$ 135,501
Operating Income (Loss)	(15,507)	(9,371)
Interest expense	(13,838)	(11,364)
Other (expense) income	(463)	1,413
Loss before income taxes	(29,808)	(19,322)
Depreciation and amortization	14,179	14,250
Capital expenditures	4,459	5,572
Unallocated Corporate
SEGMENT INFORMATION
Operating Income (Loss)	(16,268)	(16,042)
Depreciation and amortization	158	104
Service
SEGMENT INFORMATION
Revenue	53,557	53,863
Product
SEGMENT INFORMATION
Revenue	66,319	81,638
Discovery and Safety Assessment Segment
SEGMENT INFORMATION
Capital expenditures	376	2,275
Discovery and Safety Assessment Segment | Operating Segments
SEGMENT INFORMATION
Operating Income (Loss)	1,946	1,593
Depreciation and amortization	4,583	4,409
Discovery and Safety Assessment Segment | Service
SEGMENT INFORMATION
Revenue	41,843	43,563
Discovery and Safety Assessment Segment | Product
SEGMENT INFORMATION
Revenue	979	1,135
Research Models And Services Segment
SEGMENT INFORMATION
Capital expenditures	4,083	3,297
Research Models And Services Segment | Operating Segments
SEGMENT INFORMATION
Operating Income (Loss)	(1,185)	5,078
Depreciation and amortization	9,438	9,737
Research Models And Services Segment | Service
SEGMENT INFORMATION
Revenue	11,714	10,300
Research Models And Services Segment | Product
SEGMENT INFORMATION
Revenue	$ 65,340	$ 80,503