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Stock-Based Compensation (Assumptions Used To Value Options) (Details) (USD $) | 12 Months Ended
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Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected term, years | 3 years |  | 3 years |  | 3 years
Dividend yield |  |  | 0.00% | [1] |
Espp [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected volatility, minimum | 22.32% |  | 24.27% |  |
Expected volatility, maximum | 27.39% |  | 33.07% |  |
Dividend yield, minimum | 4.20% |  | 3.68% |  |
Dividend yield, maximum | 5.00% |  | 4.93% |  |
Risk-free interest rate, minimum | 0.11% |  | 0.06% |  |
Risk-free interest rate, maximum | 0.15% |  | 0.10% |  |
Stock Options For Management And Director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected volatility, minimum | 30.89% |  | 29.69% |  | 31.75%
Expected volatility, maximum | 31.57% |  | 31.43% |  | 32.34%
Expected term, years |  |  | 5 years |  |
Dividend yield, minimum | 2.77% |  | 4.18% |  | 3.43%
Dividend yield, maximum | 2.87% |  | 5.21% |  | 4.80%
Risk-free interest rate, minimum | 1.06% |  | 0.61% |  | 0.79%
Risk-free interest rate, maximum | 1.31% |  | 0.75% |  | 1.95%
Weighted-average fair value | $ 5.57 |  | $ 2.79 |  | $ 3.31
Performance Nonvested Share Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected volatility, minimum | 11.75% |  | 12.61% |  | 20.68%
Expected volatility, maximum | 70.17% |  | 71.96% |  | 143.12%
Dividend yield, minimum | 0.00% | [1] | 0.00% | [1] |
Dividend yield, maximum | 2.88% | [1] | 5.01% | [1] |
Risk-free interest rate | 0.61% |  | 0.40% |  | 0.75%
Weighted-average fair value | $ 28.59 |  | $ 16.72 |  | $ 17.46
Minimum [Member] | Stock Options For Management And Director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected term, years |  |  | 4 years |  | 5 years
Maximum [Member] | Stock Options For Management And Director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected term, years | 4 years |  | 5 years |  | 5 years
[1] | The valuation model assumes that dividends are reinvested by the Company on a continuous basis.

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- Definition Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Dividend Yield Rate Maximum + References No definition available. + Details
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- Definition Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Dividend Yield Rate Minimum + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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