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v3.20.4

Share-based compensation - Additional Information about Awards Granted under Omnibus Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Jan. 30, 2021 | Feb. 01, 2020 | Feb. 02, 2019
Omnibus Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total intrinsic value of awards vested | $ 5.0 | $ 3.5 | $ 6.8

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_PlanNameAxis=sig_OmnibusPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |