Balance Sheet Components - Summary of changed in allowance for sales incentives (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Allowance for Sales Incentives [Roll Forward]
Beginning balance	$ 20,051	$ 11,754	$ 11,195
Charged to revenue	108,843	87,703	90,246
Utilization of sales incentive allowance	(111,379)	(79,406)	(89,687)
Ending balance	$ 17,515	$ 20,051	$ 11,754