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, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 74,991	$ 62,505	$ 151,390	$ 128,669
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	9,586	10,923	18,214	22,775
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	4,682	2,467	10,102	4,998
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	17,277	13,846	36,894	28,094
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	7,305	6,531	15,047	14,760
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	3,474	2,200	6,753	5,227
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	8,875	6,004	19,217	12,370
Other Asia Pacific countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	5,686	4,741	12,494	10,912
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	17,651	15,345	31,884	28,727
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 455	$ 448	$ 785	$ 806