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Goodwill and intangibles - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Sep. 12, 2017 | Aug. 04, 2018 | Jul. 29, 2017 | Aug. 04, 2018 | Jul. 29, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwilll, acquired during period |  |  |  |  | $ 301.7
Goodwill and intangible impairments |  | $ 0.0 | $ 0.0 | $ 448.7 | $ 0.0
Impairment |  |  |  | $ 308.8 |
R2Net Inc. |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwilll, acquired during period | $ 299.1 |  |  |  |
Sterling Jewelers |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment |  | 23.2 |  |  |
Zale Jewelry |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment |  | 285.6 |  |  |
Impairment of intangible assets (excluding goodwill) |  | $ 139.9 |  |  |

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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