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Balance sheet components - Product Warranties (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Warranty liability, beginning of period $ 3,254 $ 2,450
Provision for warranties issued during the period 9,609 9,474
Settlements of warranty claims during the period (9,657) (8,828)
Warranty liability, end of period $ 3,206 $ 3,096