Goodwill and Intangible Assets (Amortization of Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of acquired intangible assets	$ 5,930	$ 7,895	$ 11,866	$ 15,716
Cost of license revenue	6,842	6,556	13,559	13,231
Total amortization expense	$ 12,772	$ 14,451	$ 25,425	$ 28,947