Equity (Schedule of Stock-based Compensation Expense - by Expense Category) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Expense:
Stock-based compensation expense	$ 1,152	$ 1,275	$ 3,285	$ 5,997
Cost of revenue
Expense:
Stock-based compensation expense	311	220	916	1,289
Selling, general and administrative
Expense:
Stock-based compensation expense	485	708	1,326	2,954
Research and development
Expense:
Stock-based compensation expense	$ 356	$ 347	$ 1,043	$ 1,754