Property, Plant, and Equipment, Net (Property, Plant, and Equipment - Net) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Property, Plant, and Equipment, Net
Land and Land Improvements	$ 79,311	$ 66,303
Buildings and improvements	372,160	197,587
Leasehold improvements	16,907	20,026
Machinery and production equipment	365,040	326,403
Computer equipment and software	118,154	103,852
Office furniture and equipment	20,939	20,992
Other	18,325	18,839
Construction in progress	252,763	223,958
Property, Plant and Equipment, Gross, Total	1,243,599	977,960
Less accumulated depreciation	(487,499)	(464,681)
Property, Plant and Equipment, Net, Total	756,100	513,279
Depreciation expense	45,994	43,773	$ 37,254
Capitalized interest	$ 8,995	$ 7,282	$ 1,215