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INCOME TAX - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at the beginning of the year	$ 2,559	$ 67,576	$ 53,763
Additions based on income tax positions related to the current year	287	6,311	8,551
Unrecognized Tax Benefits, Increase Resulting from Acquisition	6,151	0	0
Additions for income tax positions of prior years	753	512	296
Effect of foreign currency fluctuations on income tax positions	2	(5,713)	5,303
Reductions for income tax positions of prior years	(123)	(32)	(60)
Settlements with income tax authorities	(1,826)	(504)	(277)
Changes in judgment regarding tax position	0	(65,591)	0
Balance at the end of the year	$ 7,803	$ 2,559	$ 67,576

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- Definition

Unrecognized Tax Benefits, Increase (Decreases) Resulting from Foreign Currency Translation

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from acquisitions.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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