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Stock-Based Compensation (Tables) | 12 Months Ended
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Apr. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Stock Options | A summary of options for the fiscal year ended April 30, 2013, is as follows:
(in 000s, except per share amounts) |
|  | Shares |  |  | Weighted–Average Exercise Price |  |  | Weighted–Average Remaining Contractual Term |  | Aggregate Intrinsic Value |
Outstanding, beginning of the year |  | 7,308 |  |  | $ | 18.02 |  |  |  |  |
Granted |  | 979 |  |  | 17.95 |  |  |  |  |
Exercised |  | (1,414 | ) |  | 18.08 |  |  |  |  |
Forfeited or expired |  | (2,369 | ) |  | 19.22 |  |  |  |  |
Outstanding, end of the year |  | 4,504 |  |  | $ | 17.53 |  |  | 7 years |  | $ | 46,202 |
Exercisable, end of the year |  | 2,646 |  |  | $ | 18.33 |  |  | 5 years |  | $ | 25,119 |
Exercisable and expected to vest |  | 4,340 |  |  | 17.58 |  |  | 7 years |  | 44,326 |
Assumptions Used To Value Options | The following assumptions were used to value options during the periods:
Year ended April 30, |  | 2013 |  |  | 2012 |  |  | 2011 |
Options – management and director: |  |  |  |  |  |
Expected volatility |  | 29.69% - 31.43% |  |  | 31.75% - 32.34% |  |  | 28.98% - 30.20% |
Expected term |  | 4 - 5 years |  |  | 5 years |  |  | 5 years |
Dividend yield |  | 4.18% - 5.21% |  |  | 3.43% - 4.80% |  |  | 4.18% - 5.17% |
Risk–free interest rate |  | 0.61% - 0.75% |  |  | 0.79% - 1.95% |  |  | 1.26% - 1.92% |
Weighted–average fair value |  | $ | 2.79 |  |  | $ | 3.31 |  |  | $ | 2.25 |
ESPP options: |  |  |  |  |  |
Expected volatility |  | 22.32% - 27.39% |  |  | 24.27% - 33.07% |  |  | 22.75% - 23.31% |
Expected term |  | 0.5 years |  |  | 0.5 years |  |  | 0.5 years |
Dividend yield |  | 4.20% - 5.00% |  |  | 3.68% - 4.93% |  |  | 3.86% - 4.80% |
Risk–free interest rate |  | 0.11% - 0.15% |  |  | 0.06% - 0.10% |  |  | 0.19% - 0.23% |
Weighted–average fair value |  | $ | 2.60 |  |  | $ | 2.78 |  |  | $ | 2.16 |
Summary Of Nonvested Shares | A summary of nonvested shares and nonvested share units for the year ended April 30, 2013, is as follows:
(shares in 000s) |
|  | Shares |  | Weighted–Average Grant Date Fair Value |
Outstanding, beginning of the year |  | 1,454 |  |  | $ | 15.10 |
Granted |  | 1,047 |  |  | 14.38 |
Released |  | (446 | ) |  | 15.57 |
Forfeited |  | (249 | ) |  | 14.59 |
Outstanding, end of the year |  | 1,806 |  |  | $ | 14.64 |
Summary Of Nonvested Share And Performance-Based Nonvested Share Units | A summary of performance-based nonvested share units for the year ended April 30, 2013, is as follows:
(shares in 000s) |
|  | Shares |  |  | Weighted–Average Grant Date Fair Value |
Outstanding, beginning of the year |  | 187 |  |  | $ | 17.36 |
Granted |  | 513 |  |  | 16.72 |
Released |  | (17 | ) |  | 16.89 |
Forfeited |  | (25 | ) |  | 16.72 |
Outstanding, end of the year |  | 658 |  |  | $ | 16.89 |
Performance-Based Nonvested Share Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Assumptions Used To Value Options | The following assumptions were used to value performance-based nonvested share units using the Monte Carlo valuation model during fiscal years 2013 and 2012:
Year ended April 30, |  | 2013 |  |  | 2012 |
Expected volatility |  | 12.61% – 71.96% |  |  | 20.68% – 143.12% |
Expected term |  | 3 years |  |  | 3 years |
Dividend yield (1) |  | 0% – 5.01% |  |  | — | %
Risk–free interest rate |  | 0.40 | % |  | 0.75 | %
Weighted–average fair value |  | $ | 16.72 |  |  | $ | 17.46 |
(1) | The valuation model assumes that dividends are reinvested by the issuing entity on a continuous basis.

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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