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, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012
Property, Plant, and Equipment, Net
Land	$ 33,266		$ 33,266		$ 17,560
Buildings and improvements	202,560		202,560		199,692
Leasehold improvements	17,640		17,640		20,821
Machinery and production equipment	283,725		283,725		284,494
Computer equipment and software	93,825		93,825		89,565
Office furniture and equipment	22,843		22,843		23,272
Other	14,201		14,201		2,444
Construction in progress	58,165		58,165		27,643
Property, Plant and Equipment, Gross, Total	726,225		726,225		665,491
Less accumulated depreciation	(435,483)		(435,483)		(430,986)
Property, Plant and Equipment, Net, Total	290,742		290,742		234,505
Depreciation expense	8,559	9,497	28,971	29,179
Capitalized interest	$ 322	$ 147	$ 510	$ 575