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Redeemable preferred hares - Narrative (Details) - Series A Redeemable Convertible Preferred Stock - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 05, 2018 | Oct. 05, 2016 | Feb. 02, 2019 | Feb. 03, 2018
Temporary Equity [Line Items] |  |  |  |
Redeemable convertible preferred stock, shares issued |  | 625,000 |  |
Preferred stock, purchase price |  | $ 625.0 |  |
Shares issued, price per share |  | $ 1,000 |  |
Payments of stock issuance costs |  | $ 13.7 |  |
Accumulated accretion of dividends |  |  | $ 4.0 | $ 2.3
Preferred stock, dividend rate, percentage |  |  | 5.00% |
Percentage exceeding applicable conversion price | 175.00% |  |  |
Threshold period at which shares can be converted | 20 days |  |  |
Percentage of cash equal to the stated value |  |  | 101.00% |
Maximum |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Preferred dividends, percentage of average quarterly cash dividends (not more than) |  |  | 130.00% |

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- Definition Convertible Preferred Stock, Terms of Conversion, Common Stock Closing Price as Percentage of Conversion Price, Threshold + References No definition available. + Details
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- Definition Convertible Preferred Stock, Terms of Conversion, Common Stock Closing Price as Percentage of Conversion Price, Trading Period + References No definition available. + Details
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- Definition Preferred Dividends, Percentage of Average Quarterly Cash Dividends + References No definition available. + Details
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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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