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Revenue Recognition, Contracts with Customers, Assets Recognized for the Costs to Fulfill a Contract (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Assets Recognized for the Costs to Obtain or Fulfill a Contract [Abstract]      
Costs capitalized $ 12,100 $ 11,500  
Amortization 5,100 4,200 $ 2,600
Cost of revenue [Abstract]      
Operating and administrative expenses 1,022,660 997,355 963,582
Shipping and Handling [Member]      
Cost of revenue [Abstract]      
Operating and administrative expenses $ 27,800 $ 28,800 $ 32,700