Balance Sheet Components - Change in deferred revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 01, 2022	Jan. 02, 2021
Contract with Customer, Liability [Roll Forward]
Deferred revenue, beginning of period	$ 89,498	$ 62,389
Recognition of revenue included in beginning of period deferred revenue	(23,721)	(3,357)
Revenue deferred, net of revenue recognized on contracts in the respective period	9,801	9,809
Deferred revenue, end of period	$ 75,578	$ 68,841