Stock-based Compensation (Schedule of Classification of Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Total stock-based compensation expense	$ 27,936	$ 29,407
Sales and marketing
Total stock-based compensation expense	7,452	9,722
Research and development
Total stock-based compensation expense	6,932	4,900
General and administrative
Total stock-based compensation expense	10,509	11,674
License | Cost of Sales
Total stock-based compensation expense	0	322
Support and cloud services | Cost of Sales
Total stock-based compensation expense	1,486	975
Professional services | Cost of Sales
Total stock-based compensation expense	$ 1,557	$ 1,814