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Organization and principal accounting policies - Additional information (Details) $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 17, 2021 USD ($) | Mar. 29, 2021 USD ($) | Oct. 30, 2021 USD ($) | May 01, 2021 USD ($) | Oct. 30, 2021 USD ($) Reporting_Segment | Oct. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Number of reportable segments (segment) | Reporting_Segment |  |  |  |  | 3 |
Acquisition, net of cash acquired |  |  |  |  | $ 14.6 | $ 0.0
Reportable segments | North America |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition and integration related costs |  |  |  |  | 1.1 |
Rocksbox |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition, net of cash acquired |  | $ 14.6 |  |  |  |
Acquisition and integration related costs |  |  |  | $ 1.1 |  |
Diamonds Direct USA Inc. | Reportable segments | North America |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition and integration related costs |  |  | $ 2.6 |  | $ 2.6 |
Diamonds Direct USA Inc. | Subsequent Event |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition, net of cash acquired | $ 504.6 |  |  |  |  |
Percentage of voting interests acquired | 100.00% |  |  |  |  |
Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Seasonal revenues, fourth quarter sales, percent |  |  |  |  | 35.00% |
Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Seasonal revenues, fourth quarter sales, percent |  |  |  |  | 40.00% |

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