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Goodwill and intangibles - Narrative (Details) - USD ($) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 19, 2022 | Nov. 17, 2021 | Mar. 29, 2021 | Feb. 03, 2024 | Jan. 28, 2023 | Jan. 29, 2022
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  | $ 1.9 | $ 2.3 | $ 1.1
Amortization of intangible liabilities |  |  |  | $ 1.8 | $ 1.8 | $ 3.3
Rocksbox |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite-lived intangible assets acquired |  |  | $ 11.6 |  |  |
Goodwill, Acquired During Period |  |  | $ 4.6 |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  | 8 years |  |  |
Diamonds Direct USA Inc. |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period |  | $ 251.2 |  |  |  |
Indefinite-lived intangible assets acquired |  | $ 126.0 |  |  |  |
Blue Nile |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | $ 256.8 |  |  |  |  |
Indefinite-lived intangible assets acquired | $ 96.0 |  |  |  |  |

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