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Shareholders' Equity - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2020 USD ($) shares | Oct. 31, 2020 USD ($) shares
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] |  |
Stock-based compensation expense | $ | $ 0 | $ 0
PSAs |  |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] |  |
Shares granted in period (in shares) | 917,000 |
Additional stock issuable, shares | 458,500 | 458,500
RSUs |  |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] |  |
Shares granted in period (in shares) | 938,300 |
Deferred R S Us | 577,055 | 577,055
Minimum | PSAs |  |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] |  |
Vesting percentage | 0.00% |
Maximum | PSAs |  |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] |  |
Vesting percentage | 100.00% |
Maximum | RSUs |  |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] |  |
Vesting period | 5 years |

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