Annual report pursuant to Section 13 and 15(d)

Employee Stock Plans - Components of Stock-Based Compensation Expense Recognized (Detail)

v3.20.2
Employee Stock Plans - Components of Stock-Based Compensation Expense Recognized (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation expense, pre-tax $ 22,818 $ 23,385 $ 21,469
Tax benefit from stock-based compensation expense (6,642) (5,155) (7,319)
Total stock-based compensation expense, net of tax 16,176 18,230 14,150
Restricted Stock      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation expense, pre-tax 21,495 22,063 20,282
ESPP      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation expense, pre-tax $ 1,323 $ 1,322 $ 1,187