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Goodwill, Service Contracts and Other Assets - Narrative (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2015 | Aug. 31, 2014 | Jun. 01, 2015 | May. 31, 2015
Goodwill [Line Items] |  |  |  |
Goodwill impairment | $ 0 |  |  |
Goodwill | 1,272,503,000 |  |  | $ 1,195,612,000
Amortization expense for continuing operations | 3,600,000 | $ 3,500,000 |  |
Estimated amortization expense, year one | 14,600,000 |  |  |
Estimated amortization expense, year two | 11,200,000 |  |  |
Estimated amortization expense, year three | 10,300,000 |  |  |
Estimated amortization expense, year four | 9,600,000 |  |  |
Estimated amortization expense, year five | 9,200,000 |  |  |
Uniform Rental and Facility Services |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 943,152,000 |  | $ 943,900,000 | 943,909,000
First Aid and Safety Services |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 232,584,000 |  | 155,000,000 | 154,954,000
All Other |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | $ 96,767,000 |  | $ 96,700,000 | $ 96,749,000

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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