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Debt - Additional Information (Details)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 08, 2020
Oct. 25, 2018
USD ($)
Oct. 31, 2020
Jul. 31, 2020
Apr. 30, 2020
USD ($)
Apr. 30, 2021
Oct. 31, 2020
Apr. 30, 2021
Debt Instrument [Line Items]                
Debt covenant compliance             in compliance  
Maximum                
Debt Instrument [Line Items]                
Leverage ratio 4.50           3.50  
Minimum                
Debt Instrument [Line Items]                
Fixed charge coverage ratio 0.75           2.0  
Revolving Credit Facility                
Debt Instrument [Line Items]                
Amount of commitment   $ 750,000,000.0            
Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Debt term   5 years            
Drawings         $ 500,000,000.0      
Change in interest rate (percent)     0.20% 0.10%        
Line of Credit | Revolving Credit Facility | Tiffany & Co. (Shanghai) Commercial Company Limited                
Debt Instrument [Line Items]                
Debt term   3 years            
Forecast | Revolving Credit Facility                
Debt Instrument [Line Items]                
Change in facility fee (percent)               0.05%
Forecast | Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Change in interest rate (percent)           0.30%    
Senior Notes Due 2026 and 2042 | Forecast | Senior Notes | Revolving Credit Facility                
Debt Instrument [Line Items]                
Change in coupon rate (percent)               0.25%