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Restructuring plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 45 Months Ended |
--- | --- | --- | --- | ---
Oct. 30, 2021 | Oct. 31, 2020 | May 05, 2018 | Oct. 30, 2021 | Oct. 31, 2020 | Oct. 30, 2021 | Jan. 30, 2021
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | $ 1.7 | $ (3.6) |  | $ 3.3 | $ (45.2) |  |
Signet Path to Brilliance |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring plan, length |  |  | 3 years |  |  |  |
Restructuring charges | 1.7 | $ (5.6) |  | 3.3 | $ (46.6) | $ (249.3) |
Restructuring reserve | 4.3 |  |  | 4.3 |  | 4.3 | $ 10.2
Signet Path to Brilliance | Accrued expenses and other current liabilities |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring reserve | 2.3 |  |  | 2.3 |  | 2.3 |
Signet Path to Brilliance | Other noncurrent liabilities |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring reserve | $ 2.0 |  |  | $ 2.0 |  | $ 2.0 |

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