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SHARE-BASED AWARDS AND OPTIONS - Employee Stock Purchase Plan (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 7,000,000	$ 5,682,000	$ 20,472,000	$ 14,827,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized (in shares)	4.8		4.8
Maximum employee subscription amount			$ 25,000
Maximum employee subscription rate	20.00%		20.00%
Discounted market value			85.00%
Shares issued in period, net (in shares)			2.3
Shares reserved for future issuance (in shares)	2.5		2.5
Share-based compensation expense	$ 200,000	$ 100,000	$ 500,000	$ 500,000
Weighted average grant-date fair value (in dollars per share)	$ 8	$ 4	$ 8	$ 4
Discount from market price				15.00%

X

- Definition

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

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

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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)
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Aggregate number of common shares reserved for future issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Discount rate from fair value on offering date that participants pay for shares.

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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.

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

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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).

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

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

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-Name Accounting Standards Codification
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