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, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Revenue	$ 42,277	$ 37,780	$ 91,583	$ 75,231
United States
Segment Reporting Information [Line Items]
Revenue	28,324	25,207	62,991	47,573
Asia
Segment Reporting Information [Line Items]
Revenue	8,825	6,513	17,725	11,785
Europe
Segment Reporting Information [Line Items]
Revenue	4,892	1,512	10,105	3,673
Other
Segment Reporting Information [Line Items]
Revenue	$ 236	$ 4,548	$ 762	$ 12,200