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Accounts receivable, net - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
May 02, 2015
Jan. 31, 2015
May 03, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage allowance on leases 100.00%sig_PercentageAllowanceonLeases    
Loan allowance maturity period 90 days    
Finance receivable age 90 days    
Other Accounts Receivable      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross accounts receivable 9.4us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sig_OtherAccountsReceivableMember		 $ 13.7us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sig_OtherAccountsReceivableMember		 $ 12.2us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sig_OtherAccountsReceivableMember
Valuation of allowance 0.5us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sig_OtherAccountsReceivableMember		 $ 0.5us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sig_OtherAccountsReceivableMember		 $ 0.3us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sig_OtherAccountsReceivableMember