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Revenue Recognition, Contracts with Customers, Remaining Performance Obligations, Assets Recognized for the Costs to Obtain or Fulfill a Contract (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2019
Oct. 31, 2018
Remaining Performance Obligations [Abstract]        
Remaining performance obligations $ 268,300   $ 268,300  
Assets Recognized for the Costs to Obtain or Fulfill a Contract [Abstract]        
Costs capitalized 10,300   10,300  
Amortization 1,100 $ 400 2,100 $ 1,200
Cost of revenue [Abstract]        
Operating and administrative expenses 240,380 236,207 490,550 476,633
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-11-01        
Remaining Performance Obligations [Abstract]        
Remaining performance obligations $ 211,000   $ 211,000  
Expected timing of satisfaction, period 12 months   12 months  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-11-01        
Remaining Performance Obligations [Abstract]        
Remaining performance obligations $ 19,600   $ 19,600  
Expected timing of satisfaction, period    
Shipping and Handling [Member]        
Cost of revenue [Abstract]        
Operating and administrative expenses $ 7,600 $ 8,600 $ 15,000 $ 16,500