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v3.21.1

Revenue recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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May 01, 2021 | May 02, 2020
Extended Service Plans and Lifetime Warranty Agreements |  |
Disaggregation of Revenue [Line Items] |  |
Capitalized contract cost, amortization | $ 9.9 | $ 4.3

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=sig_ExtendedServicePlansandLifetimeWarrantyAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |