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Restructuring plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 42 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2021 | Aug. 01, 2020 | May 05, 2018 | Jul. 31, 2021 | Aug. 01, 2020 | Jul. 31, 2021 | Jan. 30, 2021
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | $ 0.9 | $ (28.9) |  | $ 1.6 | $ (41.6) |  |
Signet Path to Brilliance |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring plan, length |  |  | 3 years |  |  |  |
Restructuring charges | 0.9 | $ (28.7) |  | 1.6 | $ (41.0) | $ (251.0) |
Restructuring reserve | 7.2 |  |  | 7.2 |  | 7.2 | $ 10.2
Signet Path to Brilliance | Accrued expenses and other current liabilities |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring reserve | 5.0 |  |  | 5.0 |  | 5.0 |
Signet Path to Brilliance | Other noncurrent liabilities |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring reserve | $ 2.2 |  |  | $ 2.2 |  | $ 2.2 |

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