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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

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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-Publisher FASB
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-Section 45
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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
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-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 2
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