Stock-based Compensation (Schedule of Classification of Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Total stock-based compensation expense	$ 16,658	$ 16,574	$ 52,015	$ 56,139
Cost of license and subscription revenue
Total stock-based compensation expense	421	347	1,242	954
Cost of support revenue
Total stock-based compensation expense	527	1,139	2,025	3,638
Cost of professional services revenue
Total stock-based compensation expense	1,471	1,505	4,846	4,500
Sales and marketing
Total stock-based compensation expense	4,910	3,296	14,827	11,047
Research and development
Total stock-based compensation expense	3,283	2,805	9,626	9,753
General and administrative
Total stock-based compensation expense	$ 6,046	$ 7,482	$ 19,449	$ 26,247