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Common shares, treasury shares, reserves and dividends - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Jan. 30, 2021 | Feb. 01, 2020 | Feb. 02, 2019
Class of Stock [Line Items] |  |  |
Common shares, par value (usd per share) | $ 0.18 | $ 0.18 |
Treasury stock reissued (in shares) | 0.0 | 400,000 | 200,000
Treasury shares retired (in shares) | 0 |  |
Cumulative undeclared dividends | $ 0.0 |  |
Series A Redeemable Convertible Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends on redeemable convertible preferred shares | $ 1.7 | $ 1.7 | $ 1.7

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