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Subsequent event	12 Months Ended
Subsequent event	Sep. 28, 2019
Subsequent Events [Abstract]
Subsequent event	Subsequent event On November 14, 2019, the Company completed the acquisition of Snips SAS, a France-based provider of an artificial intelligence voice platform for connected devices that provides private-by-design, voice technology. Snips SAS will operate as a wholly-owned subsidiary of Sonos, Inc. The acquisition will be accounted for as a business combination, and we will begin consolidating Snips SAS’s financial results in our condensed consolidated financial statements in the first quarter of fiscal 2020. We acquired 100% of the equity interests of Snips SAS for approximately $37.5 million in cash, subject to purchase price adjustments and holdbacks. Given the recent date of the acquisition, we have not finalized our determination of the fair value of the assets acquired and liabilities assumed.