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Summary of significant accounting policies - Textual (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 19, 2018 | Sep. 29, 2018 USD ($) vendor operating_segment | Sep. 30, 2017 USD ($) | Oct. 01, 2016 USD ($) | Sep. 28, 2014 USD ($)
Accounting Policies [Abstract] |  |  |  |  |
Stock split, conversion ratio | 2 |  |  |  |
Restricted cash |  | $ 200,000 | $ 200,000 |  |
Impairment of long-lived assets |  | $ 0 | 0 |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Product warranty term |  | 1 year |  |  |
Foreign currency remeasurement and transaction gain (losses) |  | $ (941,000) | 3,568,000 | $ (782,000) |
401(k) plan maximum annual contribution per employee, percent |  | 100.00% |  |  |
Cumulative effect, new accounting principle |  |  |  |  | $ 43,400,000
Number of operating segments | operating_segment |  | 1 |  |  |
Retained earnings (accumulated deficit) |  | $ (203,611,000) | $ (188,007,000) |  | $ (110,200,000)
Goodwill |  | $ 1,000,000 |  |  |
European Union |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Product warranty term |  | 2 years |  |  |
Supplier concentration risk |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Concentration percentage |  | 98.00% | 99.00% | 99.00% |
Number of vendors | vendor |  | 1 |  |  |
Other income (expense) |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Foreign currency remeasurement and transaction gain (losses) |  | $ (1,200,000) | $ 3,200,000 | $ (2,200,000) |
Sales and marketing |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Advertising costs |  | $ 50,200,000 | $ 72,200,000 | $ 50,600,000 |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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