Stock-based Compensation (Schedule of Classification of Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Total stock-based compensation expense	$ 20,484	$ 26,967	$ 48,420	$ 56,374
Sales and marketing
Total stock-based compensation expense	7,146	9,522	14,598	19,244
Research and development
Total stock-based compensation expense	4,765	5,190	11,697	10,090
General and administrative
Total stock-based compensation expense	5,573	9,143	16,082	20,817
License | Cost of Sales
Total stock-based compensation expense	11	48	11	370
Support and cloud services | Cost of Sales
Total stock-based compensation expense	1,523	1,158	3,010	2,133
Professional services | Cost of Sales
Total stock-based compensation expense	$ 1,466	$ 1,906	$ 3,022	$ 3,720