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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, unless otherwise specified | Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 102,599 |  | $ 95,733 |  | $ 85,717
Fair Value Measurements Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 338 |  | 315 |  |
Fair Value Measurements Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 102,261 |  | 95,418 |  |
Fair Value Measurements Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 338 |  | 315 |  |
Cash and Cash Equivalents [Member] | Fair Value Measurements Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 338 |  | 315 |  |
Cash and Cash Equivalents [Member] | Fair Value Measurements Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Cash and Cash Equivalents [Member] | Fair Value Measurements Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |  |
Equity Index Value Fund [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 20,753 | [1] | 19,202 | [1] |
Equity Index Value Fund [Member] | Fair Value Measurements Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] |
Equity Index Value Fund [Member] | Fair Value Measurements Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 20,753 | [1] | 19,202 | [1] |
Equity Index Value Fund [Member] | Fair Value Measurements Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] |
Equity Index Growth Fund [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 20,485 | [1] | 19,245 | [1] |
Equity Index Growth Fund [Member] | Fair Value Measurements Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] |
Equity Index Growth Fund [Member] | Fair Value Measurements Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 20,485 | [1] | 19,245 | [1] |
Equity Index Growth Fund [Member] | Fair Value Measurements Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] |
Small Cap Index Fund [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 5,929 | [1] | 5,632 | [1] |
Small Cap Index Fund [Member] | Fair Value Measurements Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] |
Small Cap Index Fund [Member] | Fair Value Measurements Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 5,929 | [1] | 5,632 | [1] |
Small Cap Index Fund [Member] | Fair Value Measurements Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] |
International Equity Fund [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 4,166 | [1] | 3,932 | [1] |
International Equity Fund [Member] | Fair Value Measurements Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] |
International Equity Fund [Member] | Fair Value Measurements Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 4,166 | [1] | 3,932 | [1] |
International Equity Fund [Member] | Fair Value Measurements Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] |
Core Fixed Income Fund [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 33,409 | [1] | 30,000 | [1] |
Core Fixed Income Fund [Member] | Fair Value Measurements Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] |
Core Fixed Income Fund [Member] | Fair Value Measurements Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 33,409 | [1] | 30,000 | [1] |
Core Fixed Income Fund [Member] | Fair Value Measurements Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] |
Capital Preservation Fund [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 17,519 | [1] | 17,407 | [1] |
Capital Preservation Fund [Member] | Fair Value Measurements Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] |
Capital Preservation Fund [Member] | Fair Value Measurements Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 17,519 | [1] | 17,407 | [1] |
Capital Preservation Fund [Member] | Fair Value Measurements Level 3 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 0 | [1] | $ 0 | [1] |
[1] | The Collective Trust Funds are valued by applying each plan's ownership percentage in the fund to the fund's net assets at fair value at the valuation date.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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