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Revenue Recognition, Contracts with Customers, Remaining Performance Obligations (Details) - USD ($)
$ in Millions
Jul. 31, 2020
Apr. 30, 2020
Remaining Performance Obligations [Abstract]    
Remaining performance obligations $ 424.3  
Sales return reserve recorded in contract liability 39.4 $ 32.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-08-01    
Remaining Performance Obligations [Abstract]    
Remaining performance obligations excluding sales return reserve $ 369.5  
Expected timing of satisfaction, period 12 months  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-08-01    
Remaining Performance Obligations [Abstract]    
Remaining performance obligations $ 15.4  
Expected timing of satisfaction, period