Property, Plant, and Equipment, Net (Property, Plant, and Equipment - Net) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Property, Plant, and Equipment, Net
Land and Land Improvements	$ 66,303	$ 57,562
Buildings and improvements	197,587	195,008
Leasehold improvements	20,026	18,924
Machinery and production equipment	326,403	305,692
Computer equipment and software	103,852	97,538
Office furniture and equipment	20,992	24,400
Other	18,839	14,197
Construction in progress	223,958	81,428
Property, Plant and Equipment, Gross, Total	977,960	794,749
Less accumulated depreciation	(464,681)	(444,701)
Property, Plant and Equipment, Net, Total	513,279	350,048
Depreciation expense	43,773	37,254	35,808
Capitalized interest	$ 7,282	$ 1,215	$ 658