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Balance sheet components - Accrued expenses (Details) - USD ($)
$ in Thousands
Sep. 28, 2019
Sep. 29, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accrued advertising and marketing $ 25,662 $ 11,613
Accrued taxes 4,388 4,175
Accrued inventory 6,494 4,179
Accrued manufacturing, logistics and product development 14,783 8,290
Accrued general and administrative 12,455 3,322
Other accrued payables 6,074 7,108
Total accrued expenses $ 69,856 $ 38,687