Equity - Schedule of Stock-based Compensation Expense - by Expense Category (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Expense:
Stock-based compensation expense	$ 1,275	$ 2,961	$ 5,997	$ 5,572
Net effect of stock-based compensation expense on basic and diluted shares	$ (0.05)	$ (0.13)	$ (0.26)	$ (0.25)
Cost of revenue [Member]
Expense:
Stock-based compensation expense	220	614	1,289	1,067
Selling, general and administrative [Member]
Expense:
Stock-based compensation expense	708	1,342	2,954	2,898
Research and development [Member]
Expense:
Stock-based compensation expense	$ 347	$ 1,005	$ 1,754	$ 1,607