Segment and Enterprise Wide Disclosures - Operations by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Sep. 30, 2013
Net Sales to Unaffiliated Customers
Net sales	$ 126,053	$ 134,859	$ 260,891	$ 270,123
United States
Net Sales to Unaffiliated Customers
Net sales	119,588	127,772	248,196	256,590
Long-Lived Assets
Long-Lived Assets	57,794		57,794		53,992
Foreign
Net Sales to Unaffiliated Customers
Net sales	6,465	7,087	12,695	13,533
Long-Lived Assets
Long-Lived Assets	$ 1,524		$ 1,524		$ 1,799