Property, Plant, and Equipment, Net (Property, Plant, and Equipment - Net) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2013
Property, Plant, and Equipment, Net
Land and Land Improvements	$ 57,586		$ 57,586		$ 57,562
Buildings and improvements	199,593		199,593		195,008
Leasehold improvements	20,926		20,926		18,924
Machinery and production equipment	325,916		325,916		305,692
Computer equipment and software	104,972		104,972		97,538
Office furniture and equipment	24,433		24,433		24,400
Other	18,889		18,889		14,197
Construction in progress	159,733		159,733		81,428
Property, Plant and Equipment, Gross, Total	912,048		912,048		794,749
Less accumulated depreciation	(475,574)		(475,574)		(444,701)
Property, Plant and Equipment, Net, Total	436,474		436,474		350,048
Depreciation expense	10,489	8,559	32,183	28,971
Capitalized interest	$ 1,676	$ 322	$ 3,965	$ 510