Summary of Significant Accounting Policies - Textual (Details)	12 Months Ended
	Oct. 03, 2020 USD ($) operating_segment	Sep. 28, 2019 USD ($)	Sep. 29, 2018 USD ($)	Nov. 14, 2019	Sep. 29, 2019 USD ($)
Product Warranty Liability [Line Items]
Restricted cash	$ 191,000	$ 179,000
Impairment of long-lived assets		0	$ 0
Product warranty term	1 year
401(k) plan maximum annual contribution per employee	100.00%
Contributions by employer	$ 6,200,000	4,100,000
Number of operating segments (in segment) | operating_segment	1
Operating lease right-of-use assets	$ 42,342,000	0
Operating lease liability	61,270,000
Assets	816,051,000	761,605,000
Liabilities	518,212,000	480,677,000
Snips SAS
Product Warranty Liability [Line Items]
Percentage of business acquired				100.00%
Accounting Standards Update 2016-02
Product Warranty Liability [Line Items]
Operating lease right-of-use assets					$ 63,700,000
Operating lease liability					$ 73,700,000
Assets	62,500,000
Liabilities	$ 62,500,000
European Union
Product Warranty Liability [Line Items]
Product warranty term	2 years
Sales and marketing
Product Warranty Liability [Line Items]
Advertising costs	$ 43,900,000	$ 48,800,000	$ 50,200,000
One vendor | Supplier concentration risk
Product Warranty Liability [Line Items]
Concentration percentage	65.00%	83.00%	98.00%