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Redeemable preferred shares - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Oct. 05, 2016	May 04, 2019	May 05, 2018	Feb. 02, 2019
Temporary Equity [Line Items]
Accretion on redeemable convertible preferred shares		$ 8.2	$ 8.2
Series A Redeemable Convertible Preferred Stock
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%
Payments of stock issuance costs	$ 13.7
Accumulated accretion of dividends		$ 4.4	2.7	$ 4.0
Accretion on redeemable convertible preferred shares		$ 0.4	$ 0.4

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Adjustment to retained earnings for the increase in carrying amount of redeemable preferred stock that is classified as temporary equity.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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