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Stockholders' Equity (Details 3) (USD $) | 12 Months Ended
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May 31, 2014
Options outstanding |
Number outstanding | 2,673,751
Weighted-average remaining life in years | 4 years 6 months 22 days
Weighted -average exercise price | $ 14.84
Number Exercisable | 1,675,790
Weighted-average exercise price | $ 16.12
Range One [Member] |
Options outstanding |
Range of exercise prices, Lower limit | $ 6.52
Range of exercise prices, Upper limit | $ 11.93
Number outstanding | 463,965
Weighted-average remaining life in years | 5 years 7 months 21 days
Weighted -average exercise price | $ 11.37
Number Exercisable | 65,832
Weighted-average exercise price | $ 10.61
Range Two [Member] |
Options outstanding |
Range of exercise prices, Lower limit | $ 12.06
Range of exercise prices, Upper limit | $ 12.97
Number outstanding | 343,161
Weighted-average remaining life in years | 4 years 10 months 10 days
Weighted -average exercise price | $ 12.41
Number Exercisable | 155,661
Weighted-average exercise price | $ 12.44
Range Three [Member] |
Options outstanding |
Range of exercise prices, Lower limit | $ 13.18
Range of exercise prices, Upper limit | $ 13.85
Number outstanding | 432,426
Weighted-average remaining life in years | 3 years 4 months 17 days
Weighted -average exercise price | $ 13.35
Number Exercisable | 321,348
Weighted-average exercise price | $ 13.36
Range Four [Member] |
Options outstanding |
Range of exercise prices, Lower limit | $ 13.92
Range of exercise prices, Upper limit | $ 14.31
Number outstanding | 430,000
Weighted-average remaining life in years | 4 years 2 months 16 days
Weighted -average exercise price | $ 13.95
Number Exercisable | 228,750
Weighted-average exercise price | $ 13.97
Range Five [Member] |
Options outstanding |
Range of exercise prices, Lower limit | $ 14.48
Range of exercise prices, Upper limit | $ 15.57
Number outstanding | 202,880
Weighted-average remaining life in years | 1 year 1 month 2 days
Weighted -average exercise price | $ 15.25
Number Exercisable | 202,880
Weighted-average exercise price | $ 15.25
Range Six [Member] |
Options outstanding |
Range of exercise prices, Lower limit | $ 15.75
Range of exercise prices, Upper limit | $ 16.58
Number outstanding | 376,196
Weighted-average remaining life in years | 3 years 4 months 21 days
Weighted -average exercise price | $ 16.06
Number Exercisable | 276,196
Weighted-average exercise price | $ 16.03
Range Seven [Member] |
Options outstanding |
Range of exercise prices, Lower limit | $ 16.75
Range of exercise prices, Upper limit | $ 19.94
Number outstanding | 267,522
Weighted-average remaining life in years | 1 year 0 months 22 days
Weighted -average exercise price | $ 18.19
Number Exercisable | 267,522
Weighted-average exercise price | $ 18.16
Range Eight [Member] |
Options outstanding |
Range of exercise prices, Lower limit | $ 20.06
Range of exercise prices, Upper limit | $ 31.33
Number outstanding | 157,601
Weighted-average remaining life in years | 1 year 3 months 4 days
Weighted -average exercise price | $ 23.05
Number Exercisable | 157,601
Weighted-average exercise price | $ 13.81

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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 The ceiling 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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