Stock-based Compensation - Restricted Stock Unit Activity (Details) - Restricted stock units $ / shares in Units, $ in Thousands	9 Months Ended
	Jul. 03, 2021 USD ($) $ / shares shares
Number of Units
Outstanding, beginning balance (in shares)	11,647,951
Granted (in shares)	2,742,382
Released (in shares)	(3,204,542)
Forfeited (in shares)	(892,050)
Outstanding, ending balance (in shares)	10,293,741
Weighted-Average Grant Date Fair Value
Outstanding, beginning balance (in usd per share) | $ / shares	$ 10.50
Outstanding, ending balance (in usd per share) | $ / shares	$ 12.26
Additional Information
Aggregate Intrinsic Value, beginning balance | $	$ 180,543
Aggregate Intrinsic Value, ending balance | $	$ 369,751