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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 9 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Apr. 30, 2020
Assets Recognized for the Costs to Obtain or Fulfill a Contract [Abstract]          
Costs capitalized $ 11,800   $ 11,800   $ 11,500
Amortization 1,300 $ 1,000 3,900 $ 3,100  
Cost of revenue [Abstract]          
Operating and administrative expenses 251,242 245,683 735,778 736,233  
Shipping and Handling [Member]          
Cost of revenue [Abstract]          
Operating and administrative expenses $ 7,100 $ 7,700 $ 20,300 $ 22,700