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, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 80,104	$ 80,868	$ 161,014	$ 159,991
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	9,213	9,816	20,106	18,878
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	8,885	10,939	18,757	22,851
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	14,555	14,022	28,395	29,043
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	6,961	4,580	12,618	10,653
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	3,904	3,167	7,823	6,544
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	10,373	11,752	21,770	22,755
Other Asia Pacific countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	5,557	5,691	11,526	11,955
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	20,434	20,554	39,530	36,620
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 222	$ 347	$ 489	$ 692