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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, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Apr. 30, 2021
Assets Recognized for the Costs to Obtain or Fulfill a Contract [Abstract]          
Costs capitalized $ 11,500   $ 11,500   $ 12,100
Amortization 1,300 $ 1,400 2,800 $ 2,600  
Cost of revenue [Abstract]          
Operating and administrative expenses 264,190 247,167 524,779 484,536  
Shipping and Handling [Member]          
Cost of revenue [Abstract]          
Operating and administrative expenses $ 7,200 $ 6,500 $ 14,000 $ 13,200