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Revenue Recognition, Contracts with Customers, Assets Recognized for the Costs to Fulfill a Contract (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Apr. 30, 2020
Assets Recognized for the Costs to Obtain or Fulfill a Contract [Abstract]          
Costs capitalized $ 11,700   $ 11,700   $ 11,500
Amortization 1,400 $ 1,100 2,600 $ 2,100  
Cost of revenue [Abstract]          
Operating and administrative expenses 247,167 240,380 484,536 490,550  
Shipping and Handling [Member]          
Cost of revenue [Abstract]          
Operating and administrative expenses $ 6,500 $ 7,600 $ 13,200 $ 15,000