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Goodwill and intangibles - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Aug. 03, 2019	Feb. 02, 2019	Aug. 04, 2018	May 05, 2018	Aug. 03, 2019	Aug. 04, 2018	Feb. 02, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill and intangible impairments	$ 47.7		$ 0.0		$ 47.7	$ 448.7
Impairment	47.7	$ 286.7			47.7		$ 521.2
North America
Finite-Lived Intangible Assets [Line Items]
Impairment	47.7	208.8		$ 308.8	$ 47.7		$ 517.6
Impairment of intangible assets (excluding goodwill)		74.3		139.9
Other
Finite-Lived Intangible Assets [Line Items]
Impairment		3.6
Zales
Finite-Lived Intangible Assets [Line Items]
Impairment	35.2
R2Net Inc.
Finite-Lived Intangible Assets [Line Items]
Goodwill and intangible impairments		$ 77.8
Impairment	$ 12.5
Signet Path to Brillance
Finite-Lived Intangible Assets [Line Items]
Goodwill and intangible impairments				$ 448.7

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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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