Balance Sheet Components - Accrued expenses (Details) - USD ($) $ in Thousands	Oct. 03, 2020	Sep. 28, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued advertising and marketing	$ 10,609	$ 25,662
Accrued taxes	6,252	4,388
Accrued inventory	2,843	6,494
Accrued manufacturing, logistics and product development	9,753	14,783
Accrued general and administrative	10,068	12,455
Accrued restructuring	1,062	0
Other accrued payables	4,462	6,074
Total accrued expenses	$ 45,049	$ 69,856