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Goodwill and Other Intangible Assets - Goodwill Rollforward (Details) $ in Thousands	6 Months Ended
	Nov. 30, 2015 USD ($)
Goodwill [Roll Forward]
Balance at May 31, 2015	$ 1,491,833
Goodwill acquired	118,950
Effect of foreign currency translation	(36,320)
Measurement-period adjustments	2,992
Balance at November 30, 2015	1,577,455
North America Segment
Goodwill [Roll Forward]
Balance at May 31, 2015	779,734
Goodwill acquired	102,450
Effect of foreign currency translation	(5,386)
Measurement-period adjustments	(8,200)
Balance at November 30, 2015	868,598
Europe Segment
Goodwill [Roll Forward]
Balance at May 31, 2015	485,921
Goodwill acquired	0
Effect of foreign currency translation	(17,054)
Measurement-period adjustments	(411)
Balance at November 30, 2015	468,456
Asia Pacific Segment
Goodwill [Roll Forward]
Balance at May 31, 2015	226,178
Goodwill acquired	16,500
Effect of foreign currency translation	(13,880)
Measurement-period adjustments	11,603
Balance at November 30, 2015	$ 240,401

X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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X

- Definition

Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a,h)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

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

+ References

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- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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