Property, Plant, and Equipment (Schedule of Property Plant and Equipment, Net) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 1,668,783	$ 1,676,791
Less accumulated depreciation	(745,132)	(726,222)
Property, plant, and equipment, net	923,651	950,569
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	85,653	86,051
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	555,031	553,693
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	18,940	19,159
Machinery and Production Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	782,496	795,128
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	121,950	124,444
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	40,168	39,987
Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	19,990	20,012
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 44,555	$ 38,317