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Stockholders' Equity (Tables) | 12 Months Ended
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May 31, 2016
Equity [Abstract] |
Schedule summarizes stock option activity | The following table summarizes information about stock options activity for the fiscal year ended May 31, 2016.
| 2016
| Shares |  | Weighted- average exercise price |  | Weighted average remaining contractual life |  | Aggregate intrinsic value (in thousands)
Outstanding at beginning of year | 2,299,313 |  |  | $ | 14.86 |  |  |  |  |
Granted | 564,380 |  |  | $ | 14.22 |  |  |  |  |
Exercised | (145,260 | ) |  | $ | 13.73 |  |  |  |  |
Forfeited | (304,563 | ) |  | $ | 13.85 |  |  |  |  |
Expired | (132,252 | ) |  | $ | 22.75 |  |  |  |  |
Outstanding at end of year | 2,281,618 |  |  | $ | 14.45 |  |  | 3.79 |  | $ | 164 |
Options exercisable at year-end | 1,313,698 |  |  | $ | 14.25 |  |  | 2.34 |  | $ | 130 |
Options expected to vest in future periods | 854,189 |  |  | $ | 14.72 |  |  | 5.76 |  | $ | 30 |
Share based compensation arrangement by share based payment award nonvested shares and weighted average grant date fair value | The following table summarizes information about restricted stock unit activity for the year ended May 31, 2016.
| Non-Vested Stock Award Units |  | Weighted Average Grant-Date Fair Value
Non-vested at beginning of year | 563,101 |  |  | $ | 13.73 |
Granted | 259,917 |  |  | $ | 15.21 |
Vested | (160,845 | ) |  | $ | 15.39 |
Canceled | (112,396 | ) |  | $ | 13.81 |
Non-vested at end of year | 549,777 |  |  | $ | 14.62 |
Awards expected to vest in future periods | 482,594 |  |  | $ | 14.62 |

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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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