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Goodwill, Service Contracts and Other Assets - Information Regarding Segment Realignment (Details) - USD ($) $ in Thousands | May 31, 2017 | May 31, 2016 | May 31, 2015
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Goodwill | $ 2,782,335 | $ 1,276,076 | $ 1,180,094
Operating Segments | Uniform Rental and Facility Services |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 2,448,070 | 949,730 | 940,423
Operating Segments | First Aid and Safety Services |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 243,112 | 241,448 | 154,954
Operating Segments | All Other |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 91,153 | $ 84,898 | $ 84,717

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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 -Subparagraph (a) -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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