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SHARE-BASED AWARDS AND OPTIONS (Tables) | 6 Months Ended
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Nov. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of compensation cost for share-based payment arrangements, allocation of share-based compensation costs by plan | The following table summarizes share-based compensation expense and the related income tax benefit recognized for our share-based awards and stock options:
| Three Months Ended |  | Six Months Ended
| November 30, 2016 |  | November 30, 2015 |  | November 30, 2016 |  | November 30, 2015
| (in thousands)
Share-based compensation expense | $ | 8,747 |  |  | $ | 7,005 |  |  | $ | 16,366 |  |  | $ | 13,472 |
Income tax benefit | $ | 2,206 |  |  | $ | 2,279 |  |  | $ | 5,778 |  |  | $ | 4,637 |
Schedule of changes in non-vested restricted stock awards activity | The following table summarizes the changes in unvested share-based awards for the six months ended November 30, 2016:
| Shares |  | Weighted-Average Grant-Date Fair Value
| (in thousands) |  |
Unvested at May 31, 2016 | 1,606 |  |  | $ | 37.25 |
Granted | 436 |  |  | 74.29 |
Vested | (730 | ) |  | 31.38 |
Forfeited | (39 | ) |  | 44.87 |
Unvested at November 30, 2016 | 1,273 |  |  | $ | 49.46 |
Schedule of share-based compensation, stock options, activity | The following summarizes changes in unvested stock option activity for the six months ended November 30, 2016:
| Options |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
| (in thousands) |  |  |  | (years) |  | (in millions)
Outstanding at May 31, 2016 | 811 |  |  | $ | 31.81 |  |  | 5.8 |  | $ | 36.8 |
Granted | 73 |  |  | 74.66 |  |  |  |  |
Forfeited | (1 | ) |  | 22.93 |  |  |  |  |
Exercised | (124 | ) |  | 22.26 |  |  |  |  |
Outstanding at November 30, 2016 | 759 |  |  | $ | 37.51 |  |  | 6.1 |  | $ | 25.0 |
Options vested and exercisable at November 30, 2016 | 502 |  |  | $ | 28.88 |  |  | 4.8 |  | $ | 20.6 |
Schedule of share-based payment award, stock options, valuation assumptions | Fair value was estimated on the date of grant using the Black-Scholes valuation model with the following weighted-average assumptions:
| Six Months Ended
| November 30, 2016 |  | November 30, 2015
Risk-free interest rate | 1.05% |  | 1.62%
Expected volatility | 31.58% |  | 28.65%
Dividend yield | 0.06% |  | 0.10%
Expected term (years) | 5 |  | 5

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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 Tabular disclosure of the changes in outstanding nonvested 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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