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Balance sheet components - Accounts receivable, net of allowances (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Sep. 29, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts receivable $ 156,999 $ 85,840
Allowance for doubtful accounts (1,140) (872)
Allowance for sales incentives (34,205) (11,754)
Accounts receivable, net of allowances $ 121,654 $ 73,214