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, 2015 | Apr. 30, 2014 | Apr. 30, 2013 |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | $ 108,661 | $ 102,599 | $ 95,733 |
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 62,533 | 338 | |
SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 46,128 | 102,261 | |
SIGNIFICANT UNOBSERVABLE INPUTS (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 | 8 | 338 | |
Cash and Cash Equivalents [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 338 | |
Cash and Cash Equivalents [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 8 | 0 | |
Cash and Cash Equivalents [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
Mutual Fund Equity [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 62,533 | | |
Mutual Fund Equity [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 62,533 | | |
Mutual Fund Equity [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | |
Mutual Fund Equity [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | |
Equity Index Value Fund [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 20,753 | |
Equity Index Value Fund [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 0 | |
Equity Index Value Fund [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 20,753 | |
Equity Index Value Fund [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 0 | |
Equity Index Growth Fund [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 20,485 | |
Equity Index Growth Fund [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 0 | |
Equity Index Growth Fund [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 20,485 | |
Equity Index Growth Fund [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 0 | |
Small Cap Index Fund [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 5,929 | |
Small Cap Index Fund [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 0 | |
Small Cap Index Fund [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 5,929 | |
Small Cap Index Fund [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 0 | |
International Equity Fund [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 4,166 | |
International Equity Fund [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 0 | |
International Equity Fund [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 4,166 | |
International Equity Fund [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 0 | |
Mutual Fund Income Tax [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 28,408 | | |
Mutual Fund Income Tax [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | |
Mutual Fund Income Tax [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 28,408 | | |
Mutual Fund Income Tax [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | |
Core Fixed Income Fund [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 33,409 | |
Core Fixed Income Fund [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 0 | |
Core Fixed Income Fund [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 33,409 | |
Core Fixed Income Fund [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | | 0 | |
Capital Preservation Fund [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 17,712 | 17,519 | |
Capital Preservation Fund [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
Capital Preservation Fund [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | 17,712 | 17,519 | |
Capital Preservation Fund [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Fair Value of Plan Assets | $ 0 | $ 0 | |