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Goodwill and intangibles - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 29, 2021 | May 01, 2021 | May 02, 2020 | Jan. 30, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Goodwill impairment |  | $ 0.0 | $ 10.7 |
Indefinite-lived intangible asset impairment |  | 0.0 | 83.3 |
Goodwill |  | 244.9 | 238.0 | $ 238.0
North America |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Goodwill impairment |  |  | 10.7 |
Goodwill acquired |  | 6.9 |  |
Goodwill |  | $ 244.9 |  | $ 238.0
North America | Rocksbox |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Definite-lived intangible assets acquired | $ 11.5 |  |  |
Goodwill acquired | $ 6.9 |  |  |
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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