Supplemental Financial Information - Extended Warranty Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 04, 2020	Jun. 29, 2019	Jul. 04, 2020	Jun. 29, 2019
Movement in Extended Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 22,948	$ 22,901	$ 24,045	$ 23,191
Add current period deferred income	1,769	2,880	5,058	6,686
Current period recognition of income	(2,672)	(2,196)	(7,058)	(6,292)
Balance at end of period	$ 22,045	$ 23,585	$ 22,045	$ 23,585