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SHARE-BASED COMPENSATION (Tables) | 3 Months Ended
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Aug. 31, 2015
Summary of Transactions Involving Stock Units and Director Stock Grants | Transactions involving our stock units and director stock grants during the three months ended August 31, 2015 and 2014 are summarized below:
|  | Three Months Ended August 31, 2015 |  |  | Three Months Ended August 31, 2014 |
|  | (unaudited) |  |  | (unaudited) |
|  | No. of Stock Units |  |  | Weighted Average Fair Value |  |  | No. of Stock Units |  |  | Weighted Average Fair Value |
|  | (in thousands) |  |  |  |  |  | (in thousands) |  |  |  |
Stock and stock units, beginning of period |  |  | 304 |  |  | $ | 36.23 |  |  |  | 310 |  |  | $ | 31.42 |
Changes during the period: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  | 16 |  |  | $ | 44.47 |  |  |  | 2 |  |  | $ | 40.85 |
Vested and settled |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Cancelled |  |  | (1 | ) |  | $ | 38.30 |  |  |  | (7 | ) |  | $ | 31.23 |
Stock and stock units, end of period |  |  | 319 |  |  | $ | 36.64 |  |  |  | 305 |  |  | $ | 31.50 |
Summary of Transactions Involving Performance Awards | Transactions involving our performance awards during the three months ended August 31, 2015 and 2014 are summarized below:
|  | Three Months Ended August 31, 2015 |  |  | Three Months Ended August 31, 2014 |
|  | (unaudited) |  |  | (unaudited) |
|  | No. of Performance Awards |  |  | Weighted Average Fair Value |  |  | No. of Performance Awards |  |  | Weighted Average Fair Value |
|  | (in thousands) |  |  |  |  |  | (in thousands) |  |  |  |
Performance awards, beginning of period |  |  | 28 |  |  | $ | 32.86 |  |  |  | 50 |  |  | $ | 30.63 |
Changes during the period: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Vested and settled |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Cancelled |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Performance awards, end of period |  |  | 28 |  |  | $ | 32.86 |  |  |  | 50 |  |  | $ | 30.63 |
Summary of Transactions Involving Stock Options | Transactions involving our stock options during the three months ended August 31, 2015 and 2014 are summarized below:
|  | Three Months Ended August 31, 2015 |  |  | Three Months Ended August 31, 2014 |
|  | (unaudited) |  |  | (unaudited) |
|  | No. of Options |  |  | Weighted Average Exercise Price |  |  | No. of Options |  |  | Weighted Average Exercise Price |
|  | (in thousands) |  |  |  |  |  | (in thousands) |  |  |  |
Shares under option, beginning of period |  |  | 490 |  |  | $ | 24.80 |  |  |  | 816 |  |  | $ | 19.61 |
Changes during the period: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Exercised |  |  | (15 | ) |  | $ | 31.75 |  |  |  | (96 | ) |  | $ | 9.36 |
Cancelled |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Expired |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Shares under option, end of period |  |  | 475 |  |  | $ | 24.58 |  |  |  | 720 |  |  | $ | 20.96 |
Exercisable at end of period |  |  | 475 |  |  | $ | 24.58 |  |  |  | 720 |  |  | $ | 20.96 |
Total Options Outstanding, Range of Exercise Prices and Remaining Contractual Lives | Options exercisable at August 31, 2015 had a weighted-average remaining contractual life of 1.6 years. For total options outstanding at August 31, 2015, the range of exercise prices and remaining contractual lives are as follows:
Range of Prices |  | No. of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Life |
|  | (in thousands) |  |  |  |  |  | (in years) |
$9.63 to $12.82 |  |  | 30 |  |  | $ | 12.63 |  |  |  | 1.1 |
$12.83 to $16.03 |  |  | 136 |  |  | $ | 15.24 |  |  |  | 1.1 |
$16.04 to $32.05 |  |  | 309 |  |  | $ | 29.83 |  |  |  | 1.9 |
|  |  | 475 |  |  | $ | 24.58 |  |  |  | 1.6 |
Long Term Performance Stock Unit Awards [Member] |
Summary of Transactions Involving Performance Awards | Transactions involving our performance awards during the three months ended August 31, 2015 are summarized below:
|  | Three Months Ended August 31, 2015 |  |  |  |  |
|  | (unaudited) |  |  |  |  |
|  | No. of Long-Term Performance Stock Units |  |  | Weighted Average Fair Value |  |  |  |  |
|  | (in thousands) |  |  |  |  |  |  |  |
Long-term performance stock units, beginning of period |  |  | 23 |  |  | $ | 42.25 |  |  |  |  |
Changes during the period: |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |
Vested and settled |  |  | — |  |  | $ | — |  |  |  |  |
Cancelled |  |  | — |  |  | $ | — |  |  |  |  |
Long-term performance stock units, end of period |  |  | 23 |  |  | $ | 42.25 |  |  |  |  |

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- Definition Tabular disclosure of the number, aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both restricted stock units outstanding and restricted stock units fully vested and expected to vest at the date of the latest statement of financial position. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 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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