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SEGMENT AND GEOGRAPHIC INFORMATION - Narrative (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
USD ($)
segment
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
SEGMENT INFORMATION      
Number of segments | segment 2    
Settlement agreement $ (7,550) $ 0 $ 0
Revenue 513,024 490,739 572,425
Other segment operating expenses (2,845) 34,386 4,530
Total segment operating income 85,007 74,287 126,810
Unallocated corporate expenses 59,090 62,537 71,173
Depreciation and amortization of intangible assets 55,928 57,118 54,717
Goodwill impairment loss 0 0 66,367
Startup costs 2,282 3,278 6,858
Restructuring costs 1,454 3,374 4,625
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)
Stock based compensation expense, non-cash 6,028 6,740 7,844
RMS      
SEGMENT INFORMATION      
Loss Contingency Accrual, Provision 28,500    
Product      
SEGMENT INFORMATION      
Revenue 280,158 271,076 348,612
Cost of revenue (excluding depreciation and amortization of intangible assets) 221,177 221,742 242,664
Service      
SEGMENT INFORMATION      
Revenue 232,866 219,663 223,813
Cost of revenue (excluding depreciation and amortization of intangible assets) 170,867 157,826 147,819
Intersegment Eliminations      
SEGMENT INFORMATION      
Revenue (8,303) (8,006) (8,793)
Operating Segments      
SEGMENT INFORMATION      
Revenue 513,024 490,739 572,425
Operating Segments | DSA      
SEGMENT INFORMATION      
Revenue 187,943 180,116 185,090
Cost of revenue (excluding depreciation and amortization of intangible assets) 138,214 127,216 114,837
Selling, general and administrative expenses 19,737 21,159 30,385
Other segment operating expenses 1,447 1,434 1,296
Total segment operating income 28,545 30,307 38,572
Operating Segments | RMS      
SEGMENT INFORMATION      
Revenue 325,081 310,623 387,335
Cost of revenue (excluding depreciation and amortization of intangible assets) 253,830 252,352 275,647
Selling, general and administrative expenses 14,640 14,291 23,450
Other segment operating expenses 149 0 0
Operating Income (Loss) 56,462 43,980 88,238
Operating Segments | Product | DSA      
SEGMENT INFORMATION      
Revenue 4,782 4,974 4,742
Operating Segments | Product | RMS      
SEGMENT INFORMATION      
Revenue 275,376 266,102 343,870
Operating Segments | Service | DSA      
SEGMENT INFORMATION      
Revenue 183,161 175,142 180,348
Operating Segments | Service | RMS      
SEGMENT INFORMATION      
Revenue $ 49,705 $ 44,521 $ 43,465