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Balance sheet components - Other current liabilities (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Sep. 28, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Reserve for returns	$ 12,284	$ 12,110
Short-term operating lease liabilities	11,626	0
Product warranty liability	3,206	3,254
Other	2,235	2,184
Total other current liabilities	$ 29,351	$ 17,548

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Accrued Liabilities Reserve For Returns

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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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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