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, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 72,500	$ 64,781	$ 62,505	$ 66,164	$ 71,339	$ 69,809	$ 63,257	$ 66,103	$ 265,950	$ 270,508	$ 252,458
Long-lived assets	29,286				28,959				29,286	28,959	28,078
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									42,527	40,864	38,333
Long-lived assets	440				1,216				440	1,216	1,827
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									17,913	10,181	14,287
Long-lived assets	558				706				558	706	1,575
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									57,971	74,604	68,959
Long-lived assets	7				5				7	5	16
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									26,107	28,990	32,075
Long-lived assets	28,281				27,032				28,281	27,032	24,660
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									29,664	23,143	15,851
Other Asia Pacific countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									32,987	37,356	35,220
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									57,295	53,585	46,386
Other geographic areas
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 1,486	$ 1,785	$ 1,347