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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 ($) | Apr. 30, 2020 | Apr. 30, 2019
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | $ 190,743,000 | $ 169,471,000
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 190,743,000 | 169,471,000
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 | 490,000 | 469,000
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 | 490,000 | 469,000
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 Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 37,569,000 | 31,143,000
Mutual Fund Equity [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 37,569,000 | 31,143,000
Mutual Fund Equity [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 | 0
Mutual Fund Equity [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 | 0
International Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 24,578,000 | 20,553,000
International Equity [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 24,578,000 | 20,553,000
International Equity [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 |
International Equity [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value |  |
Mutual Fund Income Tax [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 128,106,000 | 117,306,000
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 | 128,106,000 | 117,306,000
Mutual Fund Income Tax [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 | 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 | $ 0

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