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Stock-Based Compensation (Tables) | 12 Months Ended
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May 31, 2013
Stock-Based Compensation Expense Included in Consolidated Statements of Income | The following table represents total stock-based compensation expense included in our Consolidated Statements of Income:
Year Ended May 31, |  | 2013 |  |  | 2012 |  |  | 2011 |
(In thousands) |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expense |  | $ | 17,145 |  |  | $ | 13,904 |  |  | $ | 12,282 |
Income tax expense (benefit) |  |  | (5,627 | ) |  |  | (4,921 | ) |  |  | (4,337 | )
Total stock-based compensation cost |  | $ | 11,518 |  |  | $ | 8,983 |  |  | $ | 7,945 |
Summary of Weighted-Average Assumptions Related to Grants | The following is a summary of our weighted-average assumptions related to grants made during the last three fiscal years:
Year Ended May 31, |  | 2013 |  |  | 2012 |  |  | 2011 |
Risk-free interest rate |  |  | 1.1 | % |  |  | 2.5 | % |  |  | 2.1 | %
Expected life of option |  |  | 7.5 yrs |  |  |  | 7.5 yrs |  |  |  | 7.5 yrs |
Expected dividend yield |  |  | 3.3 | % |  |  | 3.8 | % |  |  | 4.1 | %
Expected volatility rate |  |  | 28.2 | % |  |  | 29.5 | % |  |  | 29.6 | %
Summary of Option and Share-Based Payment Activity | The following table summarizes option and share-based payment activity (including SARs) under these plans during the fiscal year ended May 31, 2013:
|  | 2013 |
Share-Based Payments |  | Weighted Average Exercise Price |  |  | Number of Shares Under Option |
(Shares in thousands) |  |  |  |  |  |  |  |
Balance at June 1 |  | $ | 19.16 |  |  |  | 3,771 |
Options granted |  |  | 25.87 |  |  |  | 550 |
Options canceled/expired |  |  | 14.08 |  |  |  | (1 | )
Options exercised |  |  | 17.80 |  |  |  | (818 | )
Balance at May 31 |  |  | 20.54 |  |  |  | 3,502 |
Exercisable at May 31 |  | $ | 18.99 |  |  |  | 2,057 |
Stock Option Plans |  | 2013 |  |  | 2012 |  |  | 2011 |
(In millions, except per share amounts) |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  | $ | 4.96 |  |  | $ | 4.69 |  |  | $ | 3.97 |
Intrinsic value of options exercised |  | $ | 9.8 |  |  | $ | 7.0 |  |  | $ | 7.7 |
Tax benefit from options exercised |  | $ | 3.5 |  |  | $ | 1.4 |  |  | $ | 1.2 |
Fair value of SARS vested |  | $ | 1.9 |  |  | $ | 2.0 |  |  | $ | 2.2 |
Share-based performance-earned restricted stock ("PERS") |
Summary of Share-Based Performance Earned Restricted Stock Activity and Restricted Stock Units | The following table summarizes the share-based performance-earned restricted stock (“PERS”) activity during the fiscal year ended May 31, 2013:
|  | Weighted-Average Grant-Date Fair Value |  |  | 2013 |
(Shares in thousands) |  |  |  |  |  |  |  |
Balance at June 1 |  | $ | 20.18 |  |  |  | 1,070 |
Shares granted |  |  | 26.22 |  |  |  | 495 |
Shares forfeited |  |  | 20.62 |  |  |  | (19 | )
Shares vested |  |  | 18.98 |  |  |  | (92 | )
Balance at May 31 |  | $ | 22.31 |  |  |  | 1,454 |
Employee Incentive Plan Twenty Zero Seven |
Summary of Share-Based Performance Earned Restricted Stock Activity and Restricted Stock Units | The following table sets forth awards and restricted stock units issued under the 2007 Plan for the years ended May 31, 2013:
|  | Weighted-Average Grant-Date Fair Value |  |  | 2013 |
(Shares in thousands) |  |  |  |  |  |  |  |
Balance at June 1 |  | $ | 17.12 |  |  |  | 778 |
Shares granted |  |  | 25.87 |  |  |  | 89 |
Shares forfeited |  |  | 17.86 |  |  |  | (9 | )
Shares vested |  |  | 19.38 |  |  |  | (43 | )
Balance at May 31 |  | $ | 17.94 |  |  |  | 815 |
Nonvested Shares |
Summary of Share-Based Performance Earned Restricted Stock Activity and Restricted Stock Units | The following table summarizes the activity for all nonvested restricted shares during the year ended May 31, 2013:
|  | Weighted-Average Grant-Date Fair Value |  |  | Number of Shares |
(Shares in thousands) |  |  |  |  |  |  |  |
Balance at June 1 |  | $ | 19.53 |  |  |  | 2,758 |
Granted |  |  | 26.16 |  |  |  | 678 |
Vested |  |  | 19.15 |  |  |  | (171 | )
Forfeited |  |  | 19.72 |  |  |  | (29 | )
Balance at May 31 |  | $ | 20.94 |  |  |  | 3,236 |
Restricted Stock Plans, 2003 Plan |
Summary of Share-Based Performance Earned Restricted Stock Activity and Restricted Stock Units | The following table summarizes the share-based activity under the 2003 Plan during fiscal 2013:
|  | Weighted-Average Grant-Date Fair Value |  |  | 2013 |
(Shares in thousands) |  |  |  |  |  |  |  |
Balance at June 1 |  | $ | 20.23 |  |  |  | 115 |
Shares granted to Directors |  |  | 26.63 |  |  |  | 35 |
Shares vested |  |  | 19.31 |  |  |  | (37 | )
Balance at May 31 |  | $ | 22.50 |  |  |  | 113 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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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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