Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Restructuring Plans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			39 Months Ended
	May 01, 2021	May 02, 2020	May 05, 2018	May 01, 2021	Jan. 30, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (0.7)	$ 12.7
Signet Path to Brilliance
Restructuring Cost and Reserve [Line Items]
Restructuring plan, length			3 years
Restructuring charges	(0.7)	$ 12.3		$ 251.9
Restructuring reserve	8.8			8.8	$ 10.2
Signet Path to Brilliance \| Accrued expenses and other current liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	7.1			7.1
Signet Path to Brilliance \| Other noncurrent liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 1.7			$ 1.7