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Balance sheet components - Accounts receivable, net of allowances (Details) - USD ($)
$ in Thousands
Jun. 27, 2020
Sep. 28, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts receivable $ 65,450 $ 124,049
Allowance for doubtful accounts (1,369) (1,255)
Allowance for sales incentives (13,723) (20,051)
Accounts receivable, net of allowances $ 50,358 $ 102,743