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ACQUISITIONS - Narrative (Details) - USD ($)
$ in Thousands
 11 Months Ended 12 Months Ended
Nov. 07, 2022
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2025
Business Combination [Line Items]          
Goodwill   $ 311,106 $ 314,000 $ 311,106 $ 294,485
Selling, General and Administrative Expenses          
Business Combination [Line Items]          
Business acquisition-related expenses       $ 968  
Cascade and Northwest Polymers          
Business Combination [Line Items]          
Cash consideration     $ 6,036    
Elite Polymer Solutions          
Business Combination [Line Items]          
Cash consideration $ 75,981        
Purchase price of business acquisition 90,230        
Purchase price payable 14,000        
Purchase price paid subsequent to acquisition   $ 500      
Goodwill 18,669        
Identifiable intangible assets acquired 68,480        
Working capital and other net tangible assets acquired 3,082        
Elite Polymer Solutions | Customer relationships          
Business Combination [Line Items]          
Identifiable intangible assets acquired $ 68,200        
Weighted average useful life (years) 8 years