Geographic and Segment Information (Schedule of Revenues, by Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 78,392	$ 77,788	$ 74,991	$ 76,399	$ 72,500	$ 64,781	$ 62,505	$ 66,164	$ 307,570	$ 265,950	$ 270,508
Long-lived assets	46,504				29,286				46,504	29,286	28,959
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									37,954	42,527	40,864
Long-lived assets	9,696				440				9,696	440	1,216
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									32,170	17,913	10,181
Long-lived assets	3,424				558				3,424	558	706
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									64,193	57,971	74,604
Long-lived assets	7				7				7	7	5
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									41,204	26,107	28,990
Long-lived assets	33,377				28,281				33,377	28,281	27,032
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									30,102	29,664	23,143
Other Asia Pacific countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									37,897	32,987	37,356
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									62,065	57,295	53,585
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 1,985	$ 1,486	$ 1,785