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Goodwill and intangibles - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 29, 2021 | Jul. 31, 2021 | Aug. 01, 2020 | May 02, 2020 | Jul. 31, 2021 | Aug. 01, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill impairment |  | $ 0.0 | $ 0.0 |  | $ 0.0 | $ 10.7
Indefinite-lived intangible asset impairment |  | $ 0.0 | $ 0.0 |  | 0.0 | $ 83.3
North America |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  |  | $ 10.7 |  |
Goodwill acquired |  |  |  |  | $ 7.1 |
North America | Rocksbox |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Definite-lived intangible assets acquired | $ 11.5 |  |  |  |  |
Goodwill acquired | $ 7.1 |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 8 years |  |  |  |  |
North America | Certain Zales Trade Names |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Indefinite-lived intangible asset impairment |  |  |  | $ 83.3 |  |

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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=121556970&loc=d3e13816-109267 + Details
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