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Accounts receivable - Additional Information (Details) - CarVal and Castlelake | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | May 02, 2020 | Jan. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable, purchase of forward flow receivables, term | 5 years |  |
Accounts receivable, sale, percentage of revenue |  | 7.00% |
Accounts receivable, remaining purchase price of receivables sold, percentage | 5.00% |  |
Scenario, Forecast |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable, sale, percentage of revenue |  |  | 2.50%

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- Definition Accounts Receivable, Purchase of Forward Flow Receivables, Term + References No definition available. + Details
Name: | sig_AccountsReceivablePurchaseofForwardFlowReceivablesTerm
Namespace Prefix: | sig_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Accounts Receivable, Remaining Purchase Price of Receivables Sold, Percentage + References No definition available. + Details
Name: | sig_AccountsReceivableRemainingPurchasePriceofReceivablesSoldPercentage
Namespace Prefix: | sig_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Accounts Receivable, Sale, Percentage Of Revenue + References No definition available. + Details
Name: | sig_AccountsReceivableSalePercentageOfRevenue
Namespace Prefix: | sig_
Data Type: | num:percentItemType
Balance Type: | na
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
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_CounterpartyNameAxis=sig_CarValandCastlelakeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |