Stock-Based Compensation - Restricted Stock Units Activity (Details) - RSUs - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning balance (in shares)	6,716,786
Granted (in shares)	9,030,809
Exercised (in shares)	(2,406,900)
Forfeited (in shares)	(1,692,744)
Expired (in shares)	0
Outstanding, ending balance (in shares)	11,647,951
Units expected to vest (in shares)	9,530,614
Outstanding (in usd per share)	$ 10.50	$ 11.40
Aggregate Intrinsic Value	$ 180,543	$ 90,744
Vested and expected to vest - Weighted Average Exercise Price (in dollars per share)	$ 10.53
Vested and expected to vest - Weighted Average Intrinsic Value	$ 147,725