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Stock-Based Compensation, President and CEO New Hire Equity Awards (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Apr. 30, 2021 USD ($) Installment $ / shares shares
ELTIP [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Targeted long-term incentive as percentage of base salary | 300.00%
Targeted long-term incentive value | $ | $ 2.7
ELTIP [Member] | PSU Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percentage of targeted long-term incentive value | 60.00%
Grant date fair value (in dollars per share) | $ / shares | $ 59.15
Awards granted (in shares) | shares | 30,916
ELTIP [Member] | Restricted Share Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percentage of targeted long-term incentive value | 40.00%
Grant date fair value (in dollars per share) | $ / shares | $ 59.15
Awards granted (in shares) | shares | 20,611
ELTIP [Member] | Restricted Share Units [Member] | Vesting on April 30, 2018 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards vesting percentage | 25.00%
ELTIP [Member] | Restricted Share Units [Member] | Vesting on April 30, 2019 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards vesting percentage | 25.00%
ELTIP [Member] | Restricted Share Units [Member] | Vesting on April 30, 2020 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards vesting percentage | 25.00%
ELTIP [Member] | Restricted Share Units [Member] | Vesting on April 30, 2021 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards vesting percentage | 25.00%
Sign-On Grant [Member] | Restricted Share Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Grant date fair value (in dollars per share) | $ / shares | $ 59.15
Awards granted (in shares) | shares | 67,625
Grant value | $ | $ 4.0
Number of equal installments | Installment | 2

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