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Inventories - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 04, 2018 | Aug. 04, 2018 | Feb. 03, 2018 | Jan. 28, 2017
Inventory [Line Items] |  |  |  |
Inventory reserves | $ 100.9 | $ 100.9 | $ 40.6 | $ 42.5
Signet Path to Brillance |  |  |  |
Inventory [Line Items] |  |  |  |
Inventory charges(1) | $ 63.2 | $ 63.2 |  |

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