Property, Plant, and Equipment (Schedule of Property Plant and Equipment, Net) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Sep. 30, 2021
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 1,669,464	$ 1,676,791
Less accumulated depreciation	(755,996)	(726,222)
Property, plant, and equipment, net	913,468	950,569
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	84,663	86,051
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	553,244	553,693
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	20,249	19,159
Machinery and Production Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	776,186	795,128
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	121,800	124,444
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	39,611	39,987
Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	19,941	20,012
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 53,770	$ 38,317