Property, Plant, and Equipment (Schedule of Property Plant and Equipment, Net) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 1,676,791	$ 1,651,390
Less accumulated depreciation	(726,222)	(653,975)
Property, plant, and equipment, net	950,569	997,415
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	86,051	83,095
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	553,693	551,540
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	19,159	18,610
Machinery and Production Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	795,128	776,884
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	124,444	123,903
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	39,987	41,177
Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	20,012	19,814
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 38,317	$ 36,367