Property, Plant Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Property, Plant and Equipment:
Land and improvements	$ 3,693	$ 3,693
Buildings and improvements	52,343	50,891
Machinery and equipment	161,472	149,522
Construction in progress	4,264	3,689
Total Cost	221,772	207,795
Less: accumulated depreciation	(117,925)	(104,479)
Total	$ 103,847	$ 103,316