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SHARE-BASED PAYMENTS (Tables) | 12 Months Ended
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May. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Weighted average Black-Scholes assumptions for stock options granted | The fair value of each option is estimated on the date of grant using a Black-Scholes option-pricing model with the following weighted average assumptions for stock options granted:
| 2015 |  | 2014 |  | 2013
Expected volatility (%) | 17.45 |  | 21.13 |  | 22.95
Dividend yield (%) | 3.10 |  | 3.24 |  | 3.77
Risk-free interest rates (%) | 1.58 |  | 1.37 |  | 0.57
Expected life of stock option (years) | 4.92 |  | 4.91 |  | 4.80
Summary of the option activity | A summary of the option activity as of May 31, 2015 and changes during the fiscal year then ended is presented below:
Options | Number of Options (in Millions) |  | Weighted Average Exercise Price |  | Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (in Millions)
Outstanding at May 25, 2014 | 18.6 |  |  | $ | 26.15 |  |  |  |  |
Granted | 4.4 |  |  | $ | 31.71 |  |  |  |  |
Exercised | (6.4 | ) |  | $ | 23.77 |  |  |  |  | $ | 69.5 |
Forfeited | (1.0 | ) |  | $ | 31.51 |  |  |  |  |
Expired | (0.1 | ) |  | $ | 34.54 |  |  |  |  |
Outstanding at May 31, 2015 | 15.5 |  |  | $ | 28.28 |  |  | 5.65 |  | $ | 160.4 |
Exercisable at May 31, 2015 | 8.9 |  |  | $ | 25.29 |  |  | 3.37 |  | $ | 117.9 |
Changes in nonvested share units | The following table summarizes the nonvested share units as of May 31, 2015 and changes during the fiscal year then ended:
| Stock-settled |  | Cash-settled
Share Units | Share Units (in millions) |  | Weighted Average Grant-Date Fair Value |  | Share Units (in millions) |  | Weighted Average Grant-Date Fair Value
Nonvested share units at May 25, 2014 | 3.03 |  |  | $ | 28.71 |  |  | 1.58 |  |  | $ | 30.60 |
Granted | 0.93 |  |  | $ | 31.71 |  |  | 0.89 |  |  | $ | 30.89 |
Vested/Issued | (1.50 | ) |  | $ | 26.61 |  |  | (0.05 | ) |  | $ | 27.35 |
Forfeited | (0.30 | ) |  | $ | 30.58 |  |  | (0.25 | ) |  | $ | 31.02 |
Nonvested share units at May 31, 2015 | 2.16 |  |  | $ | 31.20 |  |  | 2.17 |  |  | $ | 30.74 |
Summary of the activity for performance share awards | A summary of the activity for performance share awards as of May 31, 2015 and changes during the fiscal year then ended is presented below:
Performance Shares | Shares (in Millions) |  | Weighted Average Grant-Date Fair Value
Nonvested performance shares at May 25, 2014 | 1.17 |  |  | $ | 28.27 |
Granted | 0.50 |  |  | $ | 30.89 |
Adjustments for performance results attained and dividend equivalents | 0.04 |  |  | $ | 26.11 |
Vested/Issued | (0.45 | ) |  | $ | 26.10 |
Forfeited | (0.20 | ) |  | $ | 31.50 |
Nonvested performance shares at May 31, 2015 | 1.06 |  |  | $ | 29.74 |

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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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