Property, Plant, and Equipment (Schedule of Property Plant and Equipment, Net) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 1,664,671	$ 1,676,791
Less accumulated depreciation	(730,268)	(726,222)
Property, plant, and equipment, net	934,403	950,569
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	85,829	86,051
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	554,026	553,693
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	19,071	19,159
Machinery and Production Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	780,766	795,128
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	124,590	124,444
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	40,033	39,987
Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	19,992	20,012
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 40,364	$ 38,317