Property, Plant, and Equipment, Net (Property, Plant, and Equipment - Net) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2015
Property, Plant, and Equipment, Net
Land and Land Improvements	$ 79,121		$ 79,311
Buildings and improvements	371,433		372,160
Leasehold improvements	16,656		16,907
Machinery and production equipment	371,955		365,040
Computer equipment and software	119,135		118,154
Office furniture and equipment	21,000		20,939
Other	18,333		18,325
Construction in progress	279,405		252,763
Property, Plant and Equipment, Gross, Total	1,277,038		1,243,599
Less accumulated depreciation	(495,379)		(487,499)
Property, Plant and Equipment, Net, Total	781,659		$ 756,100
Depreciation expense	10,116	$ 10,998
Capitalized interest	$ 1,873	$ 1,965