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Stockholders' equity - Textual information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 06, 2018 | Sep. 29, 2018 | Sep. 30, 2017 | Oct. 01, 2016
Equity [Abstract] |  |  |  |
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 |
Common stock, authorized (in shares) | 500,000,000 | 500,000,000 | 151,458,824 |
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 | $ 0.001 |
Preferred stock, authorized (in shares) | 10,000,000 |  |  |
Preferred stock, par value (in dollars per share) | $ 0.001 |  |  |
Class of Stock [Line Items] |  |  |  |
Repurchase of common stock |  | $ 911 | $ 10,016 | $ 145
Private placement |  |  |  |
Class of Stock [Line Items] |  |  |  |
Repurchase of common stock (in shares) |  |  | 738,682 |
Repurchase of common stock |  |  | $ 10,000 |
Issuance of common, net of issuance costs (in shares) |  |  | 742,034 |
Sale of stock, price per share (in dollars per share) |  |  | $ 13.56 |
Proceeds from sale of stock |  |  | $ 10,100 |

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