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Balance sheet components - Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Warranty liability at beginning of period $ 2,450 $ 2,437
Provision for warranties issued during the period 5,105 2,952
Settlements of warranty claims during the period (2,581) (2,404)
Warranty liability at end of period $ 4,974 $ 2,985