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Redeemable preferred shares - Additional Information (Details) - Series A Redeemable Convertible Preferred Stock - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Oct. 05, 2016	Nov. 02, 2019	Nov. 03, 2018	Nov. 02, 2019	Nov. 03, 2018	Feb. 02, 2019
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		$ 5.2	$ 3.5	$ 5.2	$ 3.5	$ 4.0
Accretion on redeemable convertible preferred shares		$ 0.4	$ 0.4	$ 1.2	$ 1.2

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