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Shareholders' equity - Dividends (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Aug. 04, 2018 | May 05, 2018 | Jul. 29, 2017 | Apr. 29, 2017 | Aug. 04, 2018 | Jul. 29, 2017
Dividends Payable [Line Items] |  |  |  |  |  |
Dividends declared per share (usd per share) | $ 0.37 | $ 0.37 | $ 0.31 | $ 0.31 | $ 0.74 | $ 0.62
Dividends, common stock | $ 19,200,000 | $ 21,800,000 | $ 18,700,000 | $ 21,300,000 | $ 41,000,000 | $ 40,000,000
Cash dividends declared | 0 |  |  |  |  |
Dividends on redeemable convertible preferred shares |  |  |  |  | 16,400,000 |
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Cash dividends declared | 7,800,000 | $ 7,800,000 | 7,800,000 | $ 7,800,000 | 15,600,000 | 15,600,000
Dividends on redeemable convertible preferred shares | $ 400,000 |  | $ 400,000 |  | 800,000 | 800,000
Accrued Expenses |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Cash dividends declared |  |  |  |  | $ 7,800,000 |
Other Liabilities |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Cash dividends declared |  |  |  |  |  | $ 7,800,000

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