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Property, Plant, and Equipment (Schedule of Property Plant and Equipment, Net) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross $ 1,927,878 $ 1,830,959
Less accumulated depreciation (941,255) (890,244)
Property, plant, and equipment, net 986,623 940,715
Land and Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 95,172 91,105
Building and Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 626,144 599,897
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 15,900 22,022
Machinery and Production Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 885,473 849,595
Computer Equipment and Software [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 116,706 120,185
Office Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 43,312 42,873
Other [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 33,591 33,392
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross $ 111,580 $ 71,890