Fair Value Measurements (Schedule of Change in Contingent Consideration) (Details) $ in Thousands	6 Months Ended
	Mar. 28, 2020 USD ($)
Change In Contingent Consideration [Roll Forward]
Balance, September 28, 2019	$ 251
Balance, March 28, 2020	17,719
Level 3
Change In Contingent Consideration [Roll Forward]
Balance, September 28, 2019	0
Additions	17,447
Interest accretion	455
Foreign currency translation	(229)
Balance, March 28, 2020	$ 17,673