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Goodwill and intangibles - Summary of Goodwill (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 28, 2017 | Jan. 28, 2017
Goodwill [Roll Forward] |  |
Beginning Balance | $ 517.6 | $ 515.5
Impact of foreign exchange | 1.0 | 2.1
Acquisitions | 348.5 |
Ending Balance | 867.1 | 517.6
Sterling Jewelers |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 23.2 | 23.2
Impact of foreign exchange | 0.0 | 0.0
Ending Balance | 371.7 | 23.2
Zale Jewelry |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 490.8 | 488.7
Impact of foreign exchange | 1.0 | 2.1
Acquisitions | 0.0 |
Ending Balance | 491.8 | 490.8
Piercing Pagoda |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 0.0 | 0.0
Impact of foreign exchange | 0.0 | 0.0
Acquisitions | 0.0 |
Ending Balance | 0.0 | 0.0
UK Jewelry |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 0.0 | 0.0
Impact of foreign exchange | 0.0 | 0.0
Acquisitions | 0.0 |
Ending Balance | 0.0 | 0.0
Other |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 3.6 | 3.6
Impact of foreign exchange | 0.0 | 0.0
Acquisitions | 0.0 |
Ending Balance | $ 3.6 | $ 3.6

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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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