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Goodwill and Intangible Assets - Goodwill Rollforward (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Goodwill [Roll Forward] |  |  |
Goodwill, gross | $ 1,491,833 | $ 1,337,285 | $ 1,044,222
Accumulated impairment losses | 0 | 0 | 0
Goodwill, balance at beginning of period | 1,337,285 | 1,044,222 |
Goodwill acquired | 264,239 | 271,577 |
Effect of foreign currency translation | (109,691) | 21,486 |
Goodwill, balance at end of period | 1,491,833 | 1,337,285 |
North America |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, gross | 779,734 | 786,655 | 519,175
Accumulated impairment losses | 0 | 0 | 0
Goodwill, balance at beginning of period | 786,655 | 519,175 |
Goodwill acquired | 4,794 | 271,577 |
Effect of foreign currency translation | (11,715) | (4,097) |
Goodwill, balance at end of period | 779,734 | 786,655 |
Europe Segment [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, gross | 485,921 | 491,038 | 464,769
Accumulated impairment losses | 0 | 0 | 0
Goodwill, balance at beginning of period | 491,038 | 464,769 |
Goodwill acquired | 67,220 | 0 |
Effect of foreign currency translation | (72,337) | 26,269 |
Goodwill, balance at end of period | 485,921 | 491,038 |
Asia Pacific Segment [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, gross | 226,178 | 59,592 | 60,278
Accumulated impairment losses | 0 | 0 | $ 0
Goodwill, balance at beginning of period | 59,592 | 60,278 |
Goodwill acquired | 192,225 | 0 |
Effect of foreign currency translation | (25,639) | (686) |
Goodwill, balance at end of period | $ 226,178 | $ 59,592 |

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- Definition Amount after 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 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- 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 + Details
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