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Acquisitions - Additional Information (Detail) (Zale Corporation, USD $)
0 Months Ended 3 Months Ended
May 29, 2014
May 02, 2015
May 03, 2014
May 29, 2014
Business Acquisition [Line Items]        
Percentage of voting interests acquired 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired     100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Consideration received by acquiree shareholders (in dollars per share) $ 21sig_ConsiderationReceivedByAcquireeShareholdersPerShare      
Total consideration transferred $ 1,458,000,000us-gaap_BusinessCombinationConsiderationTransferred1      
Cash paid to extinguish Zale Corporation outstanding debt as of May 29, 2014 478,200,000us-gaap_ExtinguishmentOfDebtAmount      
Face amount 1,400,000,000us-gaap_DebtInstrumentFaceAmount     1,400,000,000us-gaap_DebtInstrumentFaceAmount
Deferred revenue recognition period of extended service plan sales   10 years    
Initial accounting incomplete, adjustment, financial liabilities   1,400,000,000us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialLiabilities    
Acquisition related costs     9,200,000us-gaap_BusinessCombinationAcquisitionRelatedCosts  
Senior Unsecured Notes Due in 2024 | Senior Notes
       
Business Acquisition [Line Items]        
Face amount 400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_BusinessAcquisitionAxis
= sig_ZaleCorporationMember
/ us-gaap_DebtInstrumentAxis
= sig_SeniorUnsecuredNotesDuein2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
    400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_BusinessAcquisitionAxis
= sig_ZaleCorporationMember
/ us-gaap_DebtInstrumentAxis
= sig_SeniorUnsecuredNotesDuein2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Two-Year Revolving Asset-Backed Variable Funding Notes | Revolving Credit Facility
       
Business Acquisition [Line Items]        
Face amount 600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_BusinessAcquisitionAxis
= sig_ZaleCorporationMember
/ us-gaap_DebtInstrumentAxis
= sig_TwoYearRevolvingAssetBackedVariableFundingNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
    600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_BusinessAcquisitionAxis
= sig_ZaleCorporationMember
/ us-gaap_DebtInstrumentAxis
= sig_TwoYearRevolvingAssetBackedVariableFundingNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
Debt instrument, maturity period 2 years      
Five-Year Unsecured Term Loan Facility | Credit Facility
       
Business Acquisition [Line Items]        
Face amount $ 400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_BusinessAcquisitionAxis
= sig_ZaleCorporationMember
/ us-gaap_DebtInstrumentAxis
= sig_FiveYearUnsecuredTermLoanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
    $ 400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_BusinessAcquisitionAxis
= sig_ZaleCorporationMember
/ us-gaap_DebtInstrumentAxis
= sig_FiveYearUnsecuredTermLoanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Debt instrument, maturity period 5 years