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Loans, overdrafts and long-term debt - Additional Information (Details)
3 Months Ended
Sep. 27, 2019
USD ($)
May 02, 2020
USD ($)
May 04, 2019
USD ($)
Feb. 01, 2020
USD ($)
May 19, 2014
USD ($)
Senior Unsecured Notes Due in 2024 | Senior Unsecured Notes          
Debt Instrument [Line Items]          
Repayments of senior debt $ 239,600,000        
Redemption price per $1,000 of principal amount 950.00        
Unamortized debt issuance costs   $ 1,000,000.0 $ 3,600,000 $ 1,100,000  
Amortization of financing costs   100,000 $ 100,000    
Senior Asset-Based Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Unamortized debt issuance costs   8,200,000   $ 8,700,000  
Amortization of financing costs   500,000      
Debt issuance costs   9,300,000      
Signet UK Finance plc | Senior Unsecured Notes Due in 2024 | Senior Unsecured Notes          
Debt Instrument [Line Items]          
Face amount         $ 400,000,000
Stated interest rate         4.70%
Revolving Credit Facility | Senior Asset-Based Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Credit facility, maximum borrowing capacity $ 1,500,000,000        
Letters of credit outstanding   14,900,000      
Available borrowing capacity   $ 237,200,000      
Debt instrument, covenant, minimum coverage ratio   1.00      
Debt covenant, fixed covenant ratio threshold   $ 136,000,000      
Debt issuance costs   8,700,000      
Term Loan Facility | Senior Asset-Based Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Face amount   100,000,000.0      
Debt issuance costs   $ 600,000