Stock-based Compensation (Schedule of Classification of Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Total stock-based compensation expense	$ 26,967	$ 17,026	$ 56,374	$ 35,357
Cost of license revenue
Total stock-based compensation expense	48	106	370	16
Cost of support and cloud services revenue
Total stock-based compensation expense	1,158	992	2,133	2,303
Cost of professional services revenue
Total stock-based compensation expense	1,906	1,669	3,720	3,375
Sales and marketing
Total stock-based compensation expense	9,522	5,038	19,244	9,917
Research and development
Total stock-based compensation expense	5,190	3,383	10,090	6,343
General and administrative
Total stock-based compensation expense	$ 9,143	$ 5,838	$ 20,817	$ 13,403