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Stock-Based Compensation (Tables)
 12 Months Ended
Apr. 30, 2021
Share-based Payment Arrangement [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award Stock-based compensation expense and related tax items are as follows:
(in 000s)
Year ended April 30,202120202019
Stock based compensation expense$28,271 $28,045 $23,767 
Tax benefit1,802 7,175 6,076 
Realized tax benefit1,690 5,856 3,416 
Schedule of Nonvested Share Activity A summary of restricted share units and deferred stock units, including those that are performance-based, for the year ended April 30, 2021, is as follows:
(shares in 000s)
Restricted Share Units and Deferred Stock Units
Performance-Based Share Units
SharesWeighted-Average
Grant Date 
Fair Value		SharesWeighted-Average
Grant Date 
Fair Value
Outstanding, beginning of the year2,080 $25.94 1,245 $29.12 
Granted1,328 15.58 949 16.74 
Released(525)27.13 (77)24.19 
Forfeited(259)21.83 (129)19.16 
Outstanding, end of the year2,624 $21.34 1,988 $21.88 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The following assumptions were used to value performance-based share units using the Monte Carlo valuation model during the periods:
Year ended April 30, 202120202019
Expected volatility
21.14% - 84.49%
13.47% - 66.33%
13.16% - 66.47%
Expected term3 years3 years3 years
Dividend yield (1)
0% - 3.95%
0% - 3.55%
0%-4.39%
Risk-free interest rate
0.14% - 0.18%
1.70 %2.61 %
Weighted-average fair value$16.74 $32.01 $24.48 
(1)The valuation model assumes that dividends are reinvested by the Company on a continuous basis.