Stock-based Compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units $ / shares in Units, $ in Thousands	3 Months Ended
	Jan. 02, 2021 USD ($) $ / shares shares
Number of Units
Outstanding, beginning balance (in shares)	11,647,951
Forfeited (in shares)	2,501,828
Exercised (in shares)	(901,667)
Granted (in shares)	(251,801)
Outstanding, ending balance (in shares)	12,996,311
Weighted-Average Grant Date Fair Value
Outstanding, beginning balance (in usd per share) | $ / shares	$ 10.50
Outstanding, ending balance (in usd per share) | $ / shares	$ 11.64
Additional Information
Aggregate Intrinsic Value, beginning balance | $	$ 180,543
Aggregate Intrinsic Value, ending balance | $	$ 303,984