Valuation and Qualifying Accounts - Reclassification (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Apr. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Trade accounts and notes receivable	$ 405,254	$ 445,771
Other accrued expenses and current liabilities	63,812	79,848
ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Trade accounts and notes receivable	$ (3,600)
Other accrued expenses and current liabilities		$ (3,600)