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Goodwill and intangibles - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Sep. 12, 2017 | May 05, 2018 | Apr. 29, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwilll, acquired during period |  |  | $ 301.7
Goodwill and intangible impairments |  | $ 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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