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Loans, overdrafts and long-term debt - Additional Information (Detail)
3 Months Ended 12 Months Ended
May 02, 2020
USD ($)
Sep. 27, 2019
USD ($)
Jan. 30, 2021
USD ($)
Jan. 30, 2021
USD ($)
Feb. 01, 2020
USD ($)
Feb. 02, 2019
USD ($)
May 19, 2014
USD ($)
Debt Instrument [Line Items]              
Repayments of senior debt       $ 0 $ 241,500,000 $ 0  
Gain on extinguishment of debt       (400,000) 6,200,000 0  
Proceeds from revolving credit facilities       900,000,000.0 858,300,000 787,000,000.0  
Long-term debt, gross     $ 147,600,000 147,600,000 613,100,000    
Senior Unsecured Notes Due in 2024 | Signet UK Finance plc              
Debt Instrument [Line Items]              
Face amount             $ 400,000,000
Stated interest rate             4.70%
Other loans and bank overdrafts              
Debt Instrument [Line Items]              
Long-term debt, gross     0.0 0.0 87,500,000    
Credit Facility              
Debt Instrument [Line Items]              
Unamortized debt issuance costs         2,000,000.0    
Senior Unsecured Notes Due in 2024 | Senior Notes              
Debt Instrument [Line Items]              
Unamortized debt issuance costs         2,600,000    
Repayments of senior debt   $ 239,600,000          
Redemption price per $1,000 of principal amount   950.00          
Gain on extinguishment of debt         8,200,000    
Payment for debt extinguishment third party fees         1,900,000    
Unamortized debt issuance expense     900,000 900,000 1,100,000    
Amortization related to capitalized fees       200,000 600,000 $ 700,000  
Long-term debt, gross     147,600,000 147,600,000 147,500,000    
Senior Asset-Based Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Unamortized debt issuance expense     6,400,000 6,400,000 8,100,000    
Amortization related to capitalized fees       1,700,000 600,000    
Term Loan Facility              
Debt Instrument [Line Items]              
Unamortized debt issuance costs     400,000        
Term Loan Facility | Senior Asset-Based Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Face amount     100,000,000.0 100,000,000.0      
Long-term debt, gross     $ 0 $ 0 $ 100,000,000.0    
Term Loan Facility | Senior Asset-Based Credit Facility | Revolving Credit Facility              
Debt Instrument [Line Items]              
Interest rate at period end     1.70% 1.70% 2.80%    
Revolving Credit Facility | Senior Asset-Based Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Credit facility, maximum borrowing capacity   $ 1,500,000,000          
Stand-by letters of credit     $ 19,000,000.0 $ 19,000,000.0 $ 14,900,000    
Line of credit facility, remaining borrowing capacity     1,300,000,000 $ 1,300,000,000 1,200,000,000    
Proceeds from revolving credit facilities $ 900,000,000            
Covenant, minimum coverage ratio       1.00      
Debt covenant, fixed covenant ratio threshold     136,000,000 $ 136,000,000      
Capitalized fees     8,700,000 8,700,000      
Long-term debt, gross     $ 0 $ 0 $ 270,000,000.0