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Employee Benefit and Retirement Plans (Schedule Of Pension Assets By Major Category Of Plan Assets And Type Of Fair Value Measurements) (Details) - USD ($) $ in Thousands | Apr. 30, 2022 | Apr. 30, 2021
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | $ 979 | $ 193,552
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 979 | 193,552
SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 | 0
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 | 0
Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 979 | 80,524
Cash and Cash Equivalents [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 979 | 80,524
Cash and Cash Equivalents [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 | 0
Cash and Cash Equivalents [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | $ 0 | 0
Mutual Fund Income Tax [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value |  | 113,028
Mutual Fund Income Tax [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value |  | 113,028
Mutual Fund Income Tax [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value |  | 0
Mutual Fund Income Tax [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value |  | $ 0

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