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Loans, overdrafts and long-term debt - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended
May 02, 2015
May 03, 2014
Jan. 31, 2015
May 15, 2014
May 19, 2014
May 24, 2011
May 29, 2014
Feb. 19, 2014
Debt Instrument [Line Items]                
Amortization of financing costs $ 900,000us-gaap_AmortizationOfFinancingCosts $ 1,000,000us-gaap_AmortizationOfFinancingCosts            
Revolving credit facility 0us-gaap_LinesOfCreditCurrent 0us-gaap_LinesOfCreditCurrent 0us-gaap_LinesOfCreditCurrent          
Securitization facility 600,000,000us-gaap_LongTermLineOfCredit 0us-gaap_LongTermLineOfCredit 600,000,000us-gaap_LongTermLineOfCredit          
Bank Overdrafts 16,600,000us-gaap_BankOverdrafts 8,800,000us-gaap_BankOverdrafts 71,600,000us-gaap_BankOverdrafts          
Credit Facility                
Debt Instrument [Line Items]                
Debt issuance cost     6,700,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
         
Credit Facility | Revolving Credit Facility                
Debt Instrument [Line Items]                
Credit facility, maximum borrowing capacity           400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
   
Debt instrument, maturity period 5 years              
Covenant, maximum leverage ratio 2.50sig_DebtInstrumentCovenantMaximumLeverageRatio
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
             
Covenant, minimum coverage ratio 1.40sig_DebtInstrumentCovenantMinimumCoverageRatio
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
             
Debt issuance cost 6,700,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
             
Amortization of financing costs 1,200,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
  900,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
         
Letters of credit outstanding 21,000,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
8,700,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
25,400,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
         
Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Face amount 400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= sig_TermLoanMember
             
Amount outstanding 385,000,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= sig_TermLoanMember
             
Weighted average interest rate 1.45%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= sig_TermLoanMember
             
May 2011 Credit Facility | Revolving Credit Facility                
Debt Instrument [Line Items]                
Debt issuance cost   2,100,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= sig_May2011CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
           
Accumulated amortization of capitalized fees   1,400,000sig_AccumulatedAmortizationofLoanOriginationFees
/ us-gaap_DebtInstrumentAxis
= sig_May2011CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
           
Amortization of financing costs 300,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_DebtInstrumentAxis
= sig_May2011CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
200,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_DebtInstrumentAxis
= sig_May2011CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
           
Securitization Facility                
Debt Instrument [Line Items]                
Face amount       600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sig_SecuritizationFacilityMember
       
Debt instrument, maturity period       2 years        
Weighted average interest rate 1.53%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= sig_SecuritizationFacilityMember
             
Debt issuance cost 2,800,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= sig_SecuritizationFacilityMember
             
Accumulated amortization of capitalized fees 1,300,000sig_AccumulatedAmortizationofLoanOriginationFees
/ us-gaap_DebtInstrumentAxis
= sig_SecuritizationFacilityMember
  900,000sig_AccumulatedAmortizationofLoanOriginationFees
/ us-gaap_DebtInstrumentAxis
= sig_SecuritizationFacilityMember
         
Amortization of financing costs 400,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_DebtInstrumentAxis
= sig_SecuritizationFacilityMember
             
Year One | Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Quarterly repayment rate 5.00%sig_DebtInstrumentRepaymentRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= sig_TermLoanMember
/ sig_PrincipalRepaymentAxis
= sig_YearOneMember
             
Year Two | Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Quarterly repayment rate 7.50%sig_DebtInstrumentRepaymentRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= sig_TermLoanMember
/ sig_PrincipalRepaymentAxis
= sig_YearTwoMember
             
Year Three | Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Quarterly repayment rate 10.00%sig_DebtInstrumentRepaymentRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= sig_TermLoanMember
/ sig_PrincipalRepaymentAxis
= sig_YearThreeMember
             
Year Four | Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Quarterly repayment rate 12.50%sig_DebtInstrumentRepaymentRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= sig_TermLoanMember
/ sig_PrincipalRepaymentAxis
= sig_YearFourMember
             
Year Five | Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Quarterly repayment rate 15.00%sig_DebtInstrumentRepaymentRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sig_CreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= sig_TermLoanMember
/ sig_PrincipalRepaymentAxis
= sig_YearFiveMember
             
Zale                
Debt Instrument [Line Items]                
Face amount             1,400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_BusinessAcquisitionAxis
= sig_ZaleCorporationMember
 
Zale | Unsecured Bridge Facility                
Debt Instrument [Line Items]                
Face amount               800,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_BusinessAcquisitionAxis
= sig_ZaleCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
Debt issuance cost   3,000,000us-gaap_DebtIssuanceCosts
/ us-gaap_BusinessAcquisitionAxis
= sig_ZaleCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
4,000,000us-gaap_DebtIssuanceCosts
/ us-gaap_BusinessAcquisitionAxis
= sig_ZaleCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
         
Accumulated amortization of capitalized fees   800,000sig_AccumulatedAmortizationofLoanOriginationFees
/ us-gaap_BusinessAcquisitionAxis
= sig_ZaleCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
           
Amortization of financing costs 200,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_BusinessAcquisitionAxis
= sig_ZaleCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
0us-gaap_AmortizationOfFinancingCosts
/ us-gaap_BusinessAcquisitionAxis
= sig_ZaleCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
           
Signet UK Finance plc | Senior Unsecured Notes Due in 2024                
Debt Instrument [Line Items]                
Face amount         400,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= sig_SignetUKFinanceplcMember
/ us-gaap_LongtermDebtTypeAxis
= sig_SeniorUnsecuredNotesDuein2024Member
     
Debt issuance cost 7,000,000us-gaap_DebtIssuanceCosts
/ dei_LegalEntityAxis
= sig_SignetUKFinanceplcMember
/ us-gaap_LongtermDebtTypeAxis
= sig_SeniorUnsecuredNotesDuein2024Member
             
Accumulated amortization of capitalized fees 700,000sig_AccumulatedAmortizationofLoanOriginationFees
/ dei_LegalEntityAxis
= sig_SignetUKFinanceplcMember
/ us-gaap_LongtermDebtTypeAxis
= sig_SeniorUnsecuredNotesDuein2024Member
  500,000sig_AccumulatedAmortizationofLoanOriginationFees
/ dei_LegalEntityAxis
= sig_SignetUKFinanceplcMember
/ us-gaap_LongtermDebtTypeAxis
= sig_SeniorUnsecuredNotesDuein2024Member
         
Stated interest rate         4.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= sig_SignetUKFinanceplcMember
/ us-gaap_LongtermDebtTypeAxis
= sig_SeniorUnsecuredNotesDuein2024Member
     
Proceeds from debt, net of issuance costs         $ 393,900,000us-gaap_ProceedsFromDebtNetOfIssuanceCosts
/ dei_LegalEntityAxis
= sig_SignetUKFinanceplcMember
/ us-gaap_LongtermDebtTypeAxis
= sig_SeniorUnsecuredNotesDuein2024Member