Stock-based Compensation (Schedule of Classification of Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Total stock-based compensation expense	$ 18,331	$ 17,988
Cost of license and subscription revenue
Total stock-based compensation expense	413	293
Cost of support revenue
Total stock-based compensation expense	808	1,144
Cost of professional services revenue
Total stock-based compensation expense	1,706	1,457
Sales and marketing
Total stock-based compensation expense	4,879	3,621
Research and development
Total stock-based compensation expense	2,960	2,997
General and administrative
Total stock-based compensation expense	$ 7,565	$ 8,476