Segment Data and Related Information (Schedule of Revenue by Geographic Region) (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
Segment Reporting Information [Line Items]
Revenue	$ 43,091	$ 33,473	$ 42,277	$ 49,306	$ 47,488	$ 41,062	$ 37,780	$ 37,451	$ 168,147	$ 163,781	$ 200,928
United States
Segment Reporting Information [Line Items]
Revenue									107,341	111,962	140,203
Asia
Segment Reporting Information [Line Items]
Revenue									44,373	27,519	49,417
Europe
Segment Reporting Information [Line Items]
Revenue									15,318	15,032	9,081
Other
Segment Reporting Information [Line Items]
Revenue									$ 1,115	$ 9,268	$ 2,227