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Shareholders' equity - Dividends (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 28, 2017 | Jul. 29, 2017 | Apr. 29, 2017 | Oct. 29, 2016 | Jul. 30, 2016 | Apr. 30, 2016 | Oct. 28, 2017 | Oct. 29, 2016
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividends declared per share (usd per share) | $ 0.31 | $ 0.31 | $ 0.31 | $ 0.26000000 | $ 0.26 | $ 0.26 | $ 0.93 | $ 0.78000000
Dividends, common stock | $ 18,700,000 | $ 18,700,000 | $ 21,300,000 | $ 18,100,000 | $ 19,700,000 | $ 20,400,000 | $ 58,700,000 | $ 58,200,000
Cash dividends declared | 0 |  |  | 2,100,000 |  |  | 0 |
Dividends on redeemable convertible preferred shares |  |  |  |  |  |  | 24,600,000 | 100,000
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared | 7,800,000 | $ 7,800,000 | $ 7,800,000 | 0 | $ 0 | $ 0 | 23,400,000 | 0
Dividends on redeemable convertible preferred shares | $ 400,000 |  |  | $ 100,000 |  |  | 1,200,000 | 100,000
Accrued Expenses |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared |  |  |  |  |  |  | $ 7,800,000 |
Other Liabilities |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared |  |  |  |  |  |  |  | $ 2,100,000

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