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Merger Agreement (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 31, 2020
Oct. 31, 2020
Jan. 31, 2020
Nov. 24, 2019
Oct. 31, 2019
Business Acquisition [Line Items]          
Common stock par value per share (usd per share) $ 0.01 $ 0.01 $ 0.01   $ 0.01
Contingent termination fee       $ 575,000,000.0  
Merger related expenses   $ 43,000,000.0      
Tiffany & Co.          
Business Acquisition [Line Items]          
Merger related expenses $ 18,400,000 $ 43,000,000.0      
LVMH Moet Hennessy - Louis Vuitton SE | Tiffany & Co.          
Business Acquisition [Line Items]          
Common stock par value per share (usd per share)       $ 0.01  
Acquisition share price (USD per share)       $ 131.50