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Goodwill and intangibles - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 29, 2021 | May 02, 2020 | Jan. 28, 2023 | Jan. 29, 2022 | Jan. 30, 2021 | Aug. 19, 2022 | Nov. 17, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill, impairment loss |  |  | $ 0.0 | $ 0.0 | $ 10.7 |  |
Indefinite-lived intangible asset impairment |  |  | 0.0 | 0.0 | 83.3 |  |
Goodwill |  |  | 751.7 | 484.6 |  |  |
Amortization of intangible assets |  |  | 2.3 | 1.1 | 0.9 |  |
Amortization of intangible liabilities |  |  | 1.8 | 3.3 | 5.4 |  |
Diamonds Direct USA Inc. |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 251.2
Blue Nile |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 258.0 |
North America |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill, impairment loss |  | $ 10.7 |  |  |  |  |
Acquisitions |  |  | 267.1 | 246.6 |  |  |
Goodwill |  |  | $ 751.7 | $ 484.6 | $ 238.0 |  |
North America | Zales |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Indefinite-lived intangible asset impairment |  | $ 83.3 |  |  |  |  |
North America | Rocksbox |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Finite-lived intangible assets acquired | $ 11.6 |  |  |  |  |  |
Acquisitions | $ 4.6 |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 8 years |  |  |  |  |  |

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