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Fair value measurements - Outstanding Debt (Details) - USD ($) $ in Millions | Aug. 03, 2019 | Feb. 02, 2019 | Aug. 04, 2018
--- | --- | --- | ---
Carrying Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Outstanding debt | $ 671.4 | $ 688.3 | $ 705.4
Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Outstanding debt | 626.3 | 635.2 | 694.9
Senior Notes | Level 2 | Carrying Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Outstanding debt | 395.7 | 395.3 | 394.9
Senior Notes | Level 2 | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Outstanding debt | 349.2 | 340.3 | 382.1
Term Loan | Level 2 | Carrying Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Outstanding debt | 275.7 | 293.0 | 310.5
Term Loan | Level 2 | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Outstanding debt | $ 277.1 | $ 294.9 | $ 312.8

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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