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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, 2013 | Apr. 30, 2012 | Apr. 30, 2011
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 95,733 |  | $ 85,717 |  | $ 83,334
Fair Value Measurements Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 315 |  | 273 |  |
Fair Value Measurements Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 95,418 |  | 85,444 |  |
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 | 315 |  | 273 |  |
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 | 315 |  | 273 |  |
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 | 19,202 | [1] | 16,850 | [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 | 19,202 | [1] | 16,850 | [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 | 19,245 | [1] | 17,094 | [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 | 19,245 | [1] | 17,094 | [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 | 5,632 | [1] | 5,002 | [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 | 5,632 | [1] | 5,002 | [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 | 3,932 | [1] | 3,315 | [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 | 3,932 | [1] | 3,315 | [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 | 17,407 | [1] | 25,824 | [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 | 17,407 | [1] | 25,824 | [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] |
Captial Preservation Fund [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 30,000 | [1] | 17,359 | [1] |
Captial 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] |
Captial Preservation Fund [Member] | Fair Value Measurements Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 30,000 | [1] | 17,359 | [1] |
Captial 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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=21915506&loc=d3e1928-114920 Reference 4: 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=6867990&loc=d3e12355-114930 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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