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Property, Plant, and Equipment (Schedule of Property Plant and Equipment, Net) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Sep. 30, 2018
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross $ 1,654,429 $ 1,624,874
Less accumulated depreciation (590,041) (564,869)
Property, plant, and equipment, net 1,064,388 1,060,005
Land and Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 93,859 94,146
Building and Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 579,057 565,065
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 17,974 17,954
Machinery and Production Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 688,136 668,986
Computer Equipment and Software [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 120,612 124,788
Office furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 36,205 31,533
Other [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 19,351 19,366
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross $ 99,235 $ 103,036