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Goodwill, Service Contracts and Other Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2017 | May 31, 2016
Goodwill [Roll Forward] |  |
Balance at the beginning of the period | $ 1,276,076 | $ 1,180,094
Goodwill acquired | 1,507,554 | 97,097
Foreign currency translation | (1,295) | (1,115)
Balance at the end of the period | 2,782,335 | 1,276,076
Operating Segments | Uniform Rental and Facility Services |  |
Goodwill [Roll Forward] |  |
Balance at the beginning of the period | 949,730 | 940,423
Goodwill acquired | 1,499,008 | 10,020
Foreign currency translation | (668) | (713)
Balance at the end of the period | 2,448,070 | 949,730
Operating Segments | First Aid and Safety Services |  |
Goodwill [Roll Forward] |  |
Balance at the beginning of the period | 241,448 | 154,954
Goodwill acquired | 2,265 | 86,874
Foreign currency translation | (601) | (380)
Balance at the end of the period | 243,112 | 241,448
Operating Segments | All Other |  |
Goodwill [Roll Forward] |  |
Balance at the beginning of the period | 84,898 | 84,717
Goodwill acquired | 6,281 | 203
Foreign currency translation | (26) | (22)
Balance at the end of the period | $ 91,153 | $ 84,898

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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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- 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 (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits 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 + Details
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