v3.20.4
Stock-based Compensation (Summary of Stock Option Activity under Service Based Plans) (Details) - Service-based Stock Option - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Oct. 31, 2020
May 02, 2020
Aug. 01, 2020
Number of Shares      
Options outstanding – August 1, 2020 683,300    
Canceled/Forfeited (in shares) (123,000.0)    
Options outstanding – October 31, 2020 560,300    
Options vested and expected to vest at October 31, 2020 (b) [1] 556,800    
Options exercisable at October 31, 2020 440,200    
Weighted- Average Exercise Price      
Options outstanding – August 1, 2020 $ 81.05    
Canceled/Forfeited (in dollars per share) 98.88    
Options outstanding – October 31, 2020 77.15    
Options vested and expected to vest at October 31, 2020 (b) [1] 77.59    
Options exercisable at October 31, 2020 $ 95.95    
Weighted- Average Remaining Contractual Terms      
Options outstanding – August 1, 2020 4 years 4 months 24 days 4 years 7 months 6 days  
Options vested and expected to vest at October 31, 2020 (b) [1] 4 years 4 months 24 days    
Options exercisable at October 31, 2020 4 years    
Aggregate Intrinsic Value      
Options outstanding – August 1, 2020 [2] $ 0.0   $ 0.0
Options vested and expected to vest at October 31, 2020 (b) [1],[2] 0.0    
Options exercisable at October 31, 2020 [2] $ 0.0    
[1] The number of options expected to vest takes into consideration estimated expected forfeitures.
[2] The intrinsic value is the amount by which the market price at the end of the period of the underlying share of stock exceeds the exercise price of the stock option.