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PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2016	May 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment	$ 627,261	$ 497,293
Less accumulated depreciation and amortization	(200,669)	(179,932)
Property and equipment, net	493,678	374,143
Land
Property, Plant and Equipment [Line Items]
Property and equipment	6,221	1,571
Building
Property, Plant and Equipment [Line Items]
Property and equipment	$ 62,901	$ 26,236
Building | Minimum
Property, Plant and Equipment [Line Items]
Range of useful lives in years	25 years	25 years
Building | Maximum
Property, Plant and Equipment [Line Items]
Range of useful lives in years	38 years	38 years
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 209,201	$ 197,186
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Range of useful lives in years	2 years	2 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Range of useful lives in years	10 years	10 years
Software
Property, Plant and Equipment [Line Items]
Property and equipment	$ 290,997	$ 248,137
Software | Minimum
Property, Plant and Equipment [Line Items]
Range of useful lives in years	2 years	2 years
Software | Maximum
Property, Plant and Equipment [Line Items]
Range of useful lives in years	10 years	10 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 40,452	$ 20,458
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Range of useful lives in years	3 years	3 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Range of useful lives in years	15 years	15 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment	$ 17,489	$ 3,705
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Range of useful lives in years	3 years	3 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Range of useful lives in years	7 years	7 years
Work in progress
Property, Plant and Equipment [Line Items]
Property and equipment	$ 67,086	$ 56,782

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ 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 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
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-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph a
-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 8
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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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