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Property, Plant, and Equipment, Net (Property, Plant, and Equipment - Net) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Property, Plant, and Equipment, Net          
Land and Land Improvements $ 87,632   $ 87,632   $ 79,311
Buildings and improvements 499,987   499,987   372,160
Leasehold improvements 12,797   12,797   16,907
Machinery and production equipment 381,243   381,243   365,040
Computer equipment and software 111,287   111,287   118,154
Office furniture and equipment 22,268   22,268   20,939
Other 18,360   18,360   18,325
Construction in progress 185,177   185,177   252,763
Property, Plant and Equipment, Gross, Total 1,318,751   1,318,751   1,243,599
Less accumulated depreciation (492,779)   (492,779)   (487,499)
Property, Plant and Equipment, Net, Total 825,972   825,972   $ 756,100
Depreciation expense 8,633 $ 11,449 18,749 $ 22,447  
Capitalized interest $ 2,267 $ 2,801 $ 4,140 $ 4,766