Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020
Deferred tax assets:
Accrued expenses	$ 3,576	$ 4,646
Deferred revenue	10,445	11,082
Allowance for credit losses and related reserves	33,027	29,666
Deferred and stock-based compensation	24,712	6,669
Net operating loss carry-forward	104,013	86,213
Lease liabilities	112,249	126,505
Federal tax benefits related to state unrecognized tax benefits	16,682	16,729
Property and equipment	40,138	0
Intangibles - intellectual property	86,711	85,688
Valuation allowance	(55,401)	(45,124)
Total deferred tax assets	376,152	322,074
Deferred tax liabilities:
Prepaid expenses and other	(11,927)	(5,189)
Lease right of use assets	(109,726)	(123,900)
Property and equipment	0	(12,221)
Income tax method change	(56,257)	0
Intangibles	(72,650)	(64,252)
Total deferred tax liabilities	(250,560)	(205,562)
Net deferred tax assets	125,592	116,512
Deferred income tax assets	141,836	138,527
Deferred tax liabilities	$ (16,244)	$ (22,015)