Stock-based Compensation (Schedule of Classification of Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Apr. 01, 2017	Apr. 02, 2016
Total stock-based compensation expense			$ 39,565	$ 38,025
Cost of subscription, support and license revenue [Member]
Total stock-based compensation expense	$ 1,669	$ 1,100	3,106	3,005
Cost of professional service revenue
Total stock-based compensation expense	1,539	1,279	2,995	2,730
Sales and Marketing
Total stock-based compensation expense	4,130	3,777	7,751	8,059
Research and Development
Total stock-based compensation expense	3,951	2,534	6,948	5,047
General and Administrative
Total stock-based compensation expense	10,288	6,146	18,765	19,184
Share-based Compensation Expense Total [Member]
Total stock-based compensation expense	21,577	14,836	39,565	$ 38,025
stock modification [Member]
Total stock-based compensation expense		$ 10,000
ESPP [Member]
Total stock-based compensation expense	$ 700		$ 1,300