Product Warranties - Schedule of Product Warranty Liability Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance — beginning of year	$ 3,273	$ 5,756	$ 3,672
(Divested)/acquired	0	0	(49)
Provisions (benefit)	2,271	(3,053)	1,865
(Payments) direct charges	(3,686)	570	268
Balance — end of year	$ 1,858	$ 3,273	$ 5,756