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Business overview (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 06, 2018 USD ($) $ / shares shares | Sep. 29, 2018 USD ($) country | Sep. 30, 2017 USD ($) shares | Oct. 01, 2016 USD ($)
Class of Stock [Line Items] |  |  |  |
Number of countries where products are distributed | country |  | 50 |  |
Underwriting discounts and commissions | $ |  | $ 3,950 | $ 0 | $ 0
Common shares issued in conversion of outstanding shares of redeemable convertible preferred stock (shares) | 32,482,590 |  |  |
Number of shares of common stock issued for each share of redeemable convertible preferred stock (shares) | 1 |  | 32,482,590 |
IPO |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares sold in IPO (shares) | 6,388,888 |  |  |
Public offering price (in USD per share) | $ / shares | $ 15 |  |  |
Net proceeds from IPO | $ | $ 90,600 |  |  |
Underwriting discounts and commissions | $ | 5,300 |  |  |
Offering costs | $ | $ 4,600 |  |  |
Over-Allotment Option |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares sold in IPO (shares) | 833,333 |  |  |
Initial Public Offering - Shares From Existing Shareholders |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares sold in IPO (shares) | 9,583,333 |  |  |
Over-Allotment Option - Shares From Existing Shareholders |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares sold in IPO (shares) | 1,250,000 |  |  |

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