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Redeemable preferred shares - Additional Information (Details) - Series A Redeemable Convertible Preferred Stock - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 05, 2016 | Oct. 30, 2020 | Aug. 01, 2020 | Aug. 03, 2019 | Aug. 01, 2020 | Aug. 03, 2019 | Feb. 01, 2020
Temporary Equity [Line Items] |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares issued (shares) | 625,000 |  |  |  |  |  |
Preferred stock, purchase price | $ 625.0 |  |  |  |  |  |
Shares issued, price per share (in usd per share) | $ 1,000 |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  | 5.00% |  |
Preferred stock, increase in stated value (in usd per share) |  |  | $ 12.50 |  |  |  |
Payments of stock issuance costs | $ 13.7 |  |  |  |  |  |
Accumulated accretion of dividends |  |  | $ 6.5 | $ 4.8 | $ 6.5 | $ 4.8 | $ 5.7
Accretion on redeemable convertible preferred shares |  |  | $ 0.4 | $ 0.4 | $ 0.8 | $ 0.8 |
Scenario, Forecast |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Preferred stock, increase in stated value (in usd per share) |  | $ 12.66 |  |  |  |  |

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