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Stockholders' Equity (Details 2) | 12 Months Ended
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May 31, 2016 $ / shares shares
Options outstanding |
Number outstanding | shares | 2,281,618
Weighted- average remaining life in years | 3 years 9 months 14 days
Weighted- average exercise price | $ 14.45
Number Exercisable | shares | 1,313,698
Weighted- average exercise price | $ 14.25
$10.25 - $14.24 |
Options outstanding |
Range of exercise prices, Lower limit | 10.25
Range of exercise prices, Upper limit | $ 14.24
Number outstanding | shares | 1,398,385
Weighted- average remaining life in years | 3 years 5 months 15 days
Weighted- average exercise price | $ 12.93
Number Exercisable | shares | 957,571
Weighted- average exercise price | $ 13.14
$14.25 - $18.24 |
Options outstanding |
Range of exercise prices, Lower limit | 14.25
Range of exercise prices, Upper limit | $ 18.24
Number outstanding | shares | 684,427
Weighted- average remaining life in years | 4 years 9 months
Weighted- average exercise price | $ 16.04
Number Exercisable | shares | 228,571
Weighted- average exercise price | $ 15.84
$18.25 - $22.24 |
Options outstanding |
Range of exercise prices, Lower limit | 18.25
Range of exercise prices, Upper limit | $ 22.24
Number outstanding | shares | 183,695
Weighted- average remaining life in years | 3 years 3 days
Weighted- average exercise price | $ 19.30
Number Exercisable | shares | 112,445
Weighted- average exercise price | $ 19.23
$22.25 - $26.24 |
Options outstanding |
Range of exercise prices, Lower limit | 22.25
Range of exercise prices, Upper limit | $ 26.24
Number outstanding | shares | 14,250
Weighted- average remaining life in years | 5 months 23 days
Weighted- average exercise price | $ 23.62
Number Exercisable | shares | 14,251
Weighted- average exercise price | $ 23.62
$26.25 - $30.24 |
Options outstanding |
Range of exercise prices, Lower limit | 26.25
Range of exercise prices, Upper limit | $ 30.24
Number outstanding | shares | 861
Weighted- average remaining life in years | 7 months 6 days
Weighted- average exercise price | $ 26.94
Number Exercisable | shares | 860
Weighted- average exercise price | $ 26.94

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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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