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Balance sheet components - Other current liabilities (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Sep. 29, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Reserve for returns	$ 13,920	$ 5,005
Product warranty liability	4,974	2,450
Other	3,890	3,403
Total other current liabilities	$ 22,784	$ 10,858

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Accrued Liabilities, Reserve For Returns

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Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer.

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Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are due within one year or operating cycle, if longer, from the balance sheet date.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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