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Subsequent event
 9 Months Ended
Jun. 27, 2020
Subsequent Events [Abstract]  
Subsequent event Subsequent eventOn May 13, 2020, the Company was granted a temporary exclusion from the August 2019 Section 301 Tariff Action (List 4A) ("Section 301 tariffs") for its component products. Subsequent to the end of the third quarter of fiscal 2020, on July 23, 2020, the Company was granted a temporary exclusion from Section 301 tariffs for its core speaker products. These exclusions eliminate the tariffs on the Company's component and core speaker products imported from China until August 31, 2020, and entitle the Company to receive an estimated refund of approximately $30.0 million for the tariffs paid since September 2019, the date the Section 301 tariffs were imposed. The Company will need to seek an extension of these exemption requests to extend such exemptions past August 31, 2020, and in the event that the Company is unsuccessful, the Section 301 tariffs on its products will automatically reinstate. The timing of receipt of this refund is not reasonably determinable as of the date of this report and no amounts have been recorded in the consolidated financial statements as of and for the nine months ended June 27, 2020.