Stock-based Compensation (Schedule of Classification of Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Total stock-based compensation expense	$ 17,988	$ 23,189
Cost of software revenue
Total stock-based compensation expense	1,437	1,905
Cost of professional service revenue
Total stock-based compensation expense	1,457	1,451
Sales and Marketing
Total stock-based compensation expense	3,621	4,282
Research and Development
Total stock-based compensation expense	2,997	2,513
General and Administrative
Total stock-based compensation expense	8,476	13,038
stock modification [Member]
Total stock-based compensation expense		$ 10,000
ESPP [Member]
Total stock-based compensation expense	$ 600