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Stock-Based Compensation (Tables) | 12 Months Ended
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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, |  | 2021 |  | 2020 |  | 2019
Stock based compensation expense |  | $ | 28,271 |  |  | $ | 28,045 |  |  | $ | 23,767 |
Tax benefit |  | 1,802 |  |  | 7,175 |  |  | 6,076 |
Realized tax benefit |  | 1,690 |  |  | 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
|  | Shares |  | Weighted-Average Grant Date Fair Value |  | Shares |  | Weighted-Average Grant Date Fair Value
Outstanding, beginning of the year |  | 2,080 |  |  | $ | 25.94 |  |  | 1,245 |  |  | $ | 29.12 |
Granted |  | 1,328 |  |  | 15.58 |  |  | 949 |  |  | 16.74 |
Released |  | (525) |  |  | 27.13 |  |  | (77) |  |  | 24.19 |
Forfeited |  | (259) |  |  | 21.83 |  |  | (129) |  |  | 19.16 |
Outstanding, end of the year |  | 2,624 |  |  | $ | 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, |  | 2021 |  | 2020 |  | 2019
Expected volatility |  | 21.14% - 84.49% |  | 13.47% - 66.33% |  | 13.16% - 66.47%
Expected term |  | 3 years |  | 3 years |  | 3 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.

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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