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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES -Long-lived assets, including definite intangible assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Depreciation, depletion and amortization, nonproduction $ 39,734 $ 37,901 $ 43,056
Accumulated capitalized interest costs 3,489 2,228 1,463
Original cost of fully depreciated property plant and equipment $ 265,931    
Minimum      
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Long-lived assets, useful life 8 years    
Minimum | Building and Building Improvements      
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 25 years    
Minimum | Machinery and equipment      
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 2 years    
Maximum      
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Long-lived assets, useful life 25 years    
Maximum | Building and Building Improvements      
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 40 years    
Maximum | Machinery and equipment      
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 15 years    
Selling, general and administrative expenses      
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Depreciation $ 17,007 $ 16,510 $ 17,598