Geographic and Segment Information (Schedule of Revenues, by Geographical Areas) (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
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 80,868	$ 74,991	$ 159,991	$ 151,390
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	9,816	9,586	18,878	18,214
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	10,939	4,682	22,851	10,102
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	14,022	17,277	29,043	36,894
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	4,580	7,305	10,653	15,047
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	3,167	3,474	6,544	6,753
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	11,752	8,875	22,755	19,217
Other Asia Pacific countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	5,691	5,686	11,955	12,494
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	20,554	17,651	36,620	31,884
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 347	$ 455	$ 692	$ 785