v3.26.1
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]      
Amortization of Assets under Capital Lease $ 23,892 $ 21,607 $ 20,925
Accumulated capitalized interest costs 3,489 2,228 1,463
Original cost of fully depreciated property plant and equipment $ 194,981    
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    
Income Statement Location [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense      
Description Of Business And Summary Of Significant Accounting Policies [Line Items]      
Depreciation $ 9,999 $ 9,548 $ 9,507