CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2021	Apr. 30, 2021
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 32,039	$ 29,324
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	75,420,000	74,915,000
Common stock, shares outstanding	54,506,000	54,008,000