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v3.19.3

Summary of significant accounting policies - Textual (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 19, 2018 | Sep. 28, 2019 USD ($) operating_segment | Sep. 29, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 29, 2019 USD ($)
Product Warranty Liability [Line Items] |  |  |  |  |
Stock split, conversion ratio | 2 |  |  |  |
Restricted cash |  | $ 179,000 | $ 190,000 |  |
Impairment of long-lived assets |  | $ 0 | 0 | $ 0 |
Product warranty term |  | 1 year |  |  |
Foreign currency remeasurement and transaction gain (losses) |  | $ (4,035,000) | (941,000) | 3,568,000 |
401(k) plan maximum annual contribution per employee |  | 100.00% |  |  |
Number of operating segments (in segment) | operating_segment |  | 1 |  |  |
Operating lease liability |  | $ 60,000,000 |  |  |
Operating lease asset |  | 60,000,000 |  |  |
Goodwill |  | $ 1,000,000 |  |  |
Accounting Standards Update 2016-02 | Subsequent Event |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Operating lease liability |  |  |  |  | $ 65,000,000
Operating lease asset |  |  |  |  | $ 65,000,000
European Union |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Product warranty term |  | 2 years |  |  |
Other income (expense) |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Foreign currency remeasurement and transaction gain (losses) |  | $ (8,600,000) | (1,200,000) | 3,200,000 |
Sales and marketing |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Advertising costs |  | $ 48,800,000 | $ 50,200,000 | $ 72,200,000 |
One vendor | Supplier concentration risk |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Concentration percentage |  | 83.00% | 98.00% | 99.00% |

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