Credit Renewal Term

No definition available.

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Period Type:	duration

- Definition

Financing Receivable, Allowance for Credit Losses, Reversal

+ References

No definition available.

+ Details

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Namespace Prefix:	sig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Initial Credit Term

+ References

No definition available.

+ Details

Name:	sig_InitialCreditTerm
Namespace Prefix:	sig_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Servicing Agreement, Term

+ References

No definition available.

+ Details

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Namespace Prefix:	sig_
Data Type:	xbrli:durationItemType
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Period Type:	duration

- Definition

Amount of beneficial interest received as consideration for transferring noncash financial asset. Includes, but is not limited to, trade receivable in securitization transaction.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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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- Definition

The gains (losses) included in earning that represent the difference between the sale price and the carrying value of consumer loans. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainLossOnSalesOfConsumerLoans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow associated with the sale of loans receivables arising from the financing of goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfLoansReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfSecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=sig_SecuritizationFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=sig_SterlingJewelersInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=sig_GenesisFinancialSolutionMember
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Credit transaction, net - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 28, 2017	Oct. 28, 2017	Oct. 29, 2016	Oct. 28, 2017	Oct. 29, 2016
Debt Instrument [Line Items]
Reversal of allowance on receivables previously held for sale				$ (30.9)	$ 0.0
Credit transaction, net		$ (12.2)	$ 0.0	2.6	$ 0.0
Initial credit term (years)					7 years
Credit renewal term (years)					2 years
Securitization Facility
Debt Instrument [Line Items]
Credit transaction, net				(28.3)
Repayments of secured debt		$ 600.0
Consumer Portfolio Segment
Debt Instrument [Line Items]
Reversal of allowance on receivables previously held for sale				$ 20.7	$ 0.0
Sterling Jewelers, Inc. \| Consumer Portfolio Segment
Debt Instrument [Line Items]
Net proceeds	$ 960.2
Beneficial interest asset	$ 10.2
Genesis Financial Solution
Debt Instrument [Line Items]
Servicing agreement, term (years)	5 years