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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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