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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment	$ 554,075	$ 541,718
Less accumulated depreciation and amortization of property and equipment	179,932	171,965
Property and equipment, net	374,143	369,753
Depreciation and amortization expense of property and equipment	64,918	60,124	$ 55,023
Land
Property, Plant and Equipment [Line Items]
Property and equipment	1,571	1,942
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment	$ 26,236	$ 33,996
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Range of Useful Lives in Years	25 years	25 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Range of Useful Lives in Years	30 years	30 years
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 197,186	$ 204,102
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	$ 248,137	$ 224,766
Software | Minimum
Property, Plant and Equipment [Line Items]
Range of Useful Lives in Years	2 years	5 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	$ 20,458	$ 19,399
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Range of Useful Lives in Years	3 years	5 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	$ 3,705	$ 3,809
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Range of Useful Lives in Years	3 years	5 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	$ 56,782	$ 53,704

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

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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 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
-SubTopic 10
-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
-Article 7

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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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