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Goodwill, Service Contracts and Other Assets - Narrative (Details) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 01, 2015 USD ($) segment | Feb. 29, 2016 USD ($) | Feb. 28, 2015 USD ($) | Feb. 29, 2016 USD ($) | Feb. 28, 2015 USD ($) | May. 31, 2015 USD ($)
Goodwill [Line Items] |  |  |  |  |  |
Number of reporting units | segment | 5 |  |  |  |  |
Goodwill impairment | $ 0 |  |  |  |  |
Goodwill |  | $ 1,284,434,000 |  | $ 1,284,434,000 |  | $ 1,195,612,000
Amortization expense for continuing operations |  | 4,400,000 | $ 3,400,000 | 12,100,000 | $ 10,300,000 |
Estimated amortization expense, year one |  | 15,600,000 |  | 15,600,000 |  |
Estimated amortization expense, year two |  | 13,000,000 |  | 13,000,000 |  |
Estimated amortization expense, year three |  | 12,200,000 |  | 12,200,000 |  |
Estimated amortization expense, year four |  | 11,600,000 |  | 11,600,000 |  |
Estimated amortization expense, year five |  | 11,100,000 |  | 11,100,000 |  |
All Other |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Number of reporting units | segment | 3 |  |  |  |  |
Goodwill | $ 96,700,000 | 96,899,000 |  | 96,899,000 |  | 96,749,000
Uniform Rental and Facility Services |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 943,900,000 | 951,812,000 |  | 951,812,000 |  | 943,909,000
First Aid and Safety Services |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 155,000,000 | $ 235,723,000 |  | $ 235,723,000 |  | $ 154,954,000

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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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