Goodwill And Intangible Assets (Intangibles Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Mar. 31, 2018	Apr. 01, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of acquired intangible assets	$ 4,671	$ 4,723	$ 9,271	$ 9,200
Future amortization expenses, 2018	17,400		17,400
Future amortization expenses, 2019	15,100		15,100
Future amortization expenses, 2020	12,900		12,900
Future amortization expenses, 2021	10,500		10,500
Future amortization expenses, 2022	$ 8,900		$ 8,900