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Loans, overdrafts and long-term debt - Additional Information (Detail)
3 Months Ended 12 Months Ended
Oct. 28, 2017
USD ($)
Feb. 02, 2019
USD ($)
Feb. 03, 2018
USD ($)
Jan. 28, 2017
USD ($)
Sep. 12, 2017
USD ($)
May 19, 2014
USD ($)
Debt Instrument [Line Items]            
Line of credit, current   $ 0        
Amortization related to capitalized fees   2,000,000 $ 3,700,000 $ 2,800,000    
Payments of debt issuance costs     1,400,000 $ 2,700,000    
Bank overdrafts   40,100,000 14,200,000      
Senior Unsecured Notes Due in 2024 | Signet UK Finance plc            
Debt Instrument [Line Items]            
Face amount           $ 400,000,000
Capitalized fees   7,000,000        
Capitalized issuance costs written off   3,300,000 2,600,000      
Amortization related to capitalized fees   700,000 700,000      
Stated interest rate           4.70%
Bridge Loan | R2Net Inc.            
Debt Instrument [Line Items]            
Long-term debt, gross         $ 350,000,000  
Payments of debt issuance costs     1,400,000      
Interest expense, debt     900,000      
Credit Facility | Revolving Credit Facility            
Debt Instrument [Line Items]            
Credit facility, maximum borrowing capacity   700,000,000        
Capitalized fees   2,600,000        
Capitalized issuance costs written off   1,600,000 1,200,000      
Amortization related to capitalized fees   400,000 400,000      
Stand-by letters of credit   $ 14,600,000 $ 15,700,000      
Weighted average interest rate   3.87% 2.46%      
Covenant, maximum leverage ratio   2.50        
Covenant, minimum coverage ratio   1.40        
Credit Facility | Term Loan            
Debt Instrument [Line Items]            
Face amount   $ 357,500,000        
Capitalized fees   6,200,000        
Capitalized issuance costs written off   4,300,000 $ 3,500,000      
Amortization related to capitalized fees   $ 800,000        
Weighted average interest rate   3.66% 2.42%      
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]            
Face amount $ 600,000,000          
Capitalized issuance costs written off     $ 3,400,000      
Amortization related to capitalized fees $ 200,000   $ 300,000      
Weighted average interest rate     2.50%      
Debt instrument, term   2 years        
Debt issuance cost   $ 3,400,000