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Net income (loss) per share attributable to common stockholders - Computation of Basic and Diluted Earnings per Share (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 06, 2018 shares | Mar. 30, 2019 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) $ / shares shares | Mar. 30, 2019 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) $ / shares shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Common shares issued in conversion of outstanding shares of redeemable convertible preferred stock (shares) | shares | 32,482,590 |  |  |  |
Number of shares of common stock issued for each share of redeemable convertible preferred stock (shares) | 1 |  |  |  |
Numerator: |  |  |  |  |
Net income |  | $ (22,824) | $ (32,592) | $ 38,843 | $ 13,105
Less: noncumulative dividend to preferred stockholders |  | 0 | 0 | 0 | (7,293)
Less: undistributed earnings to participating securities |  | 0 | 0 | 0 | (2,059)
Net loss attributable to common stockholders—basic |  | (22,824) | (32,592) | 38,843 | 3,753
Add: undistributed earnings reallocated to holders of common stock |  | 0 | 0 | 0 | 275
Net loss attributable to common stockholders—diluted |  | $ (22,824) | $ (32,592) | $ 38,843 | $ 4,028
Denominator: |  |  |  |  |
Weighted-average shares of common stock - basic (in shares) | shares |  | 102,331,529 | 59,606,879 | 101,239,817 | 59,189,760
Weighted-average shares of common stock - diluted (in shares) | shares |  | 102,331,529 | 59,606,879 | 111,474,057 | 73,365,673
Net loss per share attributable to common stockholders: |  |  |  |  |
Net income per share attributable to common stockholders - basic (in USD per share) | $ / shares |  | $ (0.22) | $ (0.55) | $ 0.38 | $ 0.06
Net income per share attributable to common stockholders - diluted (in USD per share) | $ / shares |  | $ (0.22) | $ (0.55) | $ 0.35 | $ 0.05
Stock options |  |  |  |  |
Denominator: |  |  |  |  |
Effect of potentially dilutive stock options and RSUs | shares |  | 0 | 0 | 9,901,628 | 14,175,913
Restricted Stock Units |  |  |  |  |
Denominator: |  |  |  |  |
Effect of potentially dilutive stock options and RSUs | shares |  | 0 | 0 | 332,612 | 0

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