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Redeemable preferred shares - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 05, 2016 | Aug. 04, 2018 | Jul. 29, 2017 | Aug. 04, 2018 | Jul. 29, 2017 | Feb. 03, 2018
Temporary Equity [Line Items] |  |  |  |  |  |
Accretion on redeemable convertible preferred shares |  |  |  | $ 16.4 |  |
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Redeemable convertible preferred stock, shares issued | 625,000 |  |  |  |  |
Preferred stock, purchase price | $ 625.0 |  |  |  |  |
Shares issued, price per share | $ 1,000 |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 5.00% |  |
Payments of stock issuance costs | $ 13.7 |  |  |  |  |
Accumulated accretion of dividends |  | $ 3.1 | $ 1.4 | $ 3.1 | $ 1.4 | $ 2.3
Accretion on redeemable convertible preferred shares |  | $ 0.4 | $ 0.4 | $ 0.8 | $ 0.8 |

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