Property, Plant, and Equipment, Net (Property, Plant, and Equipment - Net) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2014
Property, Plant, and Equipment, Net
Land and Land Improvements	$ 63,626		$ 63,626		$ 66,303
Buildings and improvements	375,068		375,068		197,587
Leasehold improvements	17,696		17,696		20,026
Machinery and production equipment	338,531		338,531		326,403
Computer equipment and software	105,715		105,715		103,852
Office furniture and equipment	23,906		23,906		20,992
Other	18,466		18,466		18,839
Construction in progress	216,021		216,021		223,958
Property, Plant and Equipment, Gross, Total	1,159,029		1,159,029		977,960
Less accumulated depreciation	(470,693)		(470,693)		(464,681)
Property, Plant and Equipment, Net, Total	688,336		688,336		$ 513,279
Depreciation expense	11,280	$ 10,489	33,727	$ 32,183
Capitalized interest	$ 2,544	$ 1,676	$ 7,310	$ 3,965