Segment Data and Related Information (Schedule of Revenue by Geographic Region) (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
Segment Reporting Information [Line Items]
Revenue	$ 42,247	$ 42,277	$ 86,458	$ 91,583
United States
Segment Reporting Information [Line Items]
Revenue	27,016	28,324	55,113	62,991
Asia
Segment Reporting Information [Line Items]
Revenue	11,093	8,825	21,380	17,725
Europe
Segment Reporting Information [Line Items]
Revenue	3,986	4,892	9,420	10,105
Other
Segment Reporting Information [Line Items]
Revenue	$ 152	$ 236	$ 545	$ 762