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Debt - Credit Facilities (Details)
¥ in Millions
1 Months Ended 12 Months Ended
Oct. 25, 2018
USD ($)
Aug. 31, 2017
USD ($)
Jul. 31, 2016
CNY (¥)
Jan. 31, 2019
USD ($)
Jan. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Debt instrument, term 5 years        
New Credit Facility          
Debt Instrument [Line Items]          
Line of credit, maximum borrowing capacity $ 750,000,000.0        
New Credit Facility | Federal Funds Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.50%        
New Credit Facility | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate 1.00%        
Commercial Paper          
Debt Instrument [Line Items]          
Line of credit, maximum borrowing capacity   $ 750,000,000.0      
Commercial Paper | Four-year Credit Facility          
Debt Instrument [Line Items]          
Debt instrument, term   4 years      
Line of credit, maximum borrowing capacity   $ 375,000,000.0      
Commercial Paper | Five-year Credit Facility          
Debt Instrument [Line Items]          
Debt instrument, term   5 years      
Line of credit, maximum borrowing capacity   $ 375,000,000.0      
Credit Facilities          
Debt Instrument [Line Items]          
Line of credit, amount outstanding       $ 13,500,000 $ 33,500,000
Letters of credit       6,100,000 6,800,000
Line of credit, remaining borrowing capacity       $ 730,400,000 $ 709,700,000
Line of credit, interest rate at period end       1.05% 1.10%
2016 Tiffany Shanghai Credit Agreement          
Debt Instrument [Line Items]          
Debt instrument, term     3 years    
Line of credit, maximum borrowing capacity     ¥ 990.0 $ 147,400,000  
Line of credit, amount outstanding       26,800,000 $ 43,800,000
Line of credit, remaining borrowing capacity       $ 120,600,000 $ 112,700,000
Line of credit, interest rate at period end       4.35% 4.35%
Other credit facilities          
Debt Instrument [Line Items]          
Line of credit, maximum borrowing capacity       $ 135,600,000 $ 139,000,000
Line of credit, amount outstanding       $ 73,100,000 $ 43,300,000
Line of credit, interest rate during period       3.93% 6.87%