SHARE-BASED AWARDS AND OPTIONS - Employee Stock Purchase Plan (Details) - USD ($) $ / shares in Units, shares in Millions	12 Months Ended
May 31, 2016	May 31, 2015	May 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 30,809,000	$ 21,056,000	$ 29,793,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized (in shares)	4.8
Maximum employee subscription amount (up to)	$ 25,000
Maximum employee subscription rate (up to) (as a percentage)	20.00%
Discounted market value (as a percentage)	85.00%
Shares issued in period (in shares)	2.3
Shares reserved for future issuance (in shares)	2.5
Share-based compensation expense	$ 700,000	$ 600,000	$ 600,000
Weighted average grant-date fair value (in dollars per share)	$ 7.56	$ 4.04	$ 3.57
Discount from market price (as a percentage)	15.00%

Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Amount

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Discounted Market Price, Purchase Date

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
-Subparagraph (b)
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
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- Definition

Discount rate from fair value on offering date that participants pay for shares.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

+ References

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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-Publisher FASB
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- Definition

The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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