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Inventories - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 03, 2019	Aug. 04, 2018	Aug. 03, 2019	Aug. 04, 2018	Feb. 02, 2019
Inventory [Line Items]
Inventory reserves	$ 87.6	$ 100.9	$ 87.6	$ 100.9	$ 95.3
Cost of sales | Signet Path to Brillance
Inventory [Line Items]
Inventory write-down	$ 4.4	$ 63.2	$ 4.4	$ 63.2

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