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Balance Sheet Components - Change in deferred revenue (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Contract with Customer, Liability [Roll Forward]    
Deferred revenue, beginning of period $ 62,388 $ 56,449
Recognition of revenue included in beginning of period deferred revenue (13,381) (10,210)
Revenue deferred, net of revenue recognized on contracts in the respective period 21,379 14,126
Deferred revenue, end of period $ 70,386 $ 60,365