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Loans, Overdrafts and Long-Term Debt - Additional Information (Detail)
12 Months Ended
May 19, 2014
USD ($)
May 15, 2014
USD ($)
Feb. 19, 2014
USD ($)
Jan. 28, 2017
USD ($)
Jan. 30, 2016
USD ($)
Jan. 31, 2015
USD ($)
Jul. 30, 2016
USD ($)
Apr. 30, 2016
USD ($)
May 29, 2014
USD ($)
Debt Instrument [Line Items]                  
Amortization related to capitalized fees       $ 2,800,000 $ 3,600,000 $ 7,400,000      
Securitization facility       600,000,000 600,000,000        
Bank overdrafts       14,200,000 24,400,000        
Zale                  
Debt Instrument [Line Items]                  
Face amount                 $ 1,400,000,000
Term Loan                  
Debt Instrument [Line Items]                  
Proceeds from debt, net of issuance costs       0 0 400,000,000      
Unsecured Bridge Facility | Zale                  
Debt Instrument [Line Items]                  
Face amount     $ 800,000,000            
Debt instrument, maturity period     364 days            
Capitalized fees, noncurrent           $ 4,000,000      
Senior Unsecured Notes Due in 2024 | Signet UK Finance plc                  
Debt Instrument [Line Items]                  
Capitalized fees       7,000,000          
Capitalized issuance costs written off       1,900,000 1,200,000        
Amortization related to capitalized fees       700,000 700,000        
Face amount $ 400,000,000                
Stated interest rate 4.70%                
Proceeds from debt, net of issuance costs $ 393,900,000                
Credit Facility | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Credit facility, maximum borrowing capacity             $ 700,000,000 $ 400,000,000  
Capitalized fees, current       1,400,000          
Capitalized fees       2,600,000          
Capitalized issuance costs written off       800,000 400,000        
Amortization related to capitalized fees       400,000 300,000        
Stand-by letters of credit       $ 15,300,000 $ 28,800,000        
Weighted average interest rate       1.71% 1.18%        
Covenant, maximum leverage ratio       2.50          
Covenant, minimum coverage ratio       1.40          
Credit Facility | Term Loan                  
Debt Instrument [Line Items]                  
Capitalized fees, current       $ 700,000          
Capitalized fees       6,200,000          
Capitalized issuance costs written off       2,700,000 $ 1,800,000        
Amortization related to capitalized fees       $ 900,000 $ 1,000,000        
Weighted average interest rate       1.78% 1.48%        
Face amount       $ 357,500,000.0          
Credit Facility | Term Loan | Year One                  
Debt Instrument [Line Items]                  
Quarterly repayment rate       5.00%          
Credit Facility | Term Loan | Year Two                  
Debt Instrument [Line Items]                  
Quarterly repayment rate       7.50%          
Credit Facility | Term Loan | Year Three                  
Debt Instrument [Line Items]                  
Quarterly repayment rate       10.00%          
Credit Facility | Term Loan | Year Four                  
Debt Instrument [Line Items]                  
Quarterly repayment rate       12.50%          
Credit Facility | Term Loan | Year Five                  
Debt Instrument [Line Items]                  
Quarterly repayment rate       15.00%          
Securitization Facility                  
Debt Instrument [Line Items]                  
Capitalized fees, current       $ 600,000          
Capitalized issuance costs written off       3,100,000 $ 2,400,000        
Amortization related to capitalized fees       $ 700,000 $ 1,500,000        
Weighted average interest rate       2.05% 1.61%        
Face amount   $ 600,000,000              
Debt instrument, maturity period   2 years              
Debt issuance cost       $ 3,400,000