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Stockholders' Equity (Details 2)	12 Months Ended
	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

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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

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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

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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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

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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)
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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)
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