SEGMENT AND GEOGRAPHIC INFORMATION - Operating Segments Revenue and Operating Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
SEGMENT INFORMATION
Revenue	$ 513,024	$ 490,739	$ 572,425
Operating Income (Loss)	(30,902)	(86,406)	(81,460)
Interest expense	(56,593)	(46,884)	(43,019)
Other (expense) income	(273)	2,530	237
(Loss) income before income taxes	(87,768)	(130,760)	(124,242)
Depreciation and amortization	55,928	57,118	54,717
Capital expenditures	16,615	22,310	27,503
Assets	771,114	781,361
Operating Segments
SEGMENT INFORMATION
Revenue	513,024	490,739	572,425
Segment Reporting, Reconciling Item, Corporate Nonsegment
SEGMENT INFORMATION
Depreciation and amortization	708	639	58
Service
SEGMENT INFORMATION
Revenue	232,866	219,663	223,813
Product
SEGMENT INFORMATION
Revenue	280,158	271,076	348,612
DSA
SEGMENT INFORMATION
Capital expenditures	2,536	5,679	13,314
Assets	266,838	267,576
DSA | Operating Segments
SEGMENT INFORMATION
Revenue	187,943	180,116	185,090
Depreciation and amortization	17,979	17,865	16,371
DSA | Service | Operating Segments
SEGMENT INFORMATION
Revenue	183,161	175,142	180,348
DSA | Product | Operating Segments
SEGMENT INFORMATION
Revenue	4,782	4,974	4,742
RMS
SEGMENT INFORMATION
Capital expenditures	14,079	16,631	14,189
Assets	504,276	513,785
RMS | Operating Segments
SEGMENT INFORMATION
Revenue	325,081	310,623	387,335
Operating Income (Loss)	56,462	43,980	88,238
Depreciation and amortization	37,241	38,614	38,288
RMS | Service | Operating Segments
SEGMENT INFORMATION
Revenue	49,705	44,521	43,465
RMS | Product | Operating Segments
SEGMENT INFORMATION
Revenue	$ 275,376	$ 266,102	$ 343,870