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Acquisitions and Divestitures - Narrative (Details) |  | 12 Months Ended
--- | --- | ---
Mar. 21, 2017 USD ($) $ / shares | May 31, 2018 segment_business | May 31, 2017 segment_business | May 31, 2015 transaction buyer
Business Acquisition [Line Items] |  |  |  |
Number of transactions involved in sale of business | transaction |  |  |  | 3
Number of buyers involved in sale of business | buyer |  |  |  | 3
Series of Business Acquisitions | Uniform Rental and Facility Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of businesses acquired | segment_business |  | 5 | 3 |
Series of Business Acquisitions | First Aid and Safety Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of businesses acquired | segment_business |  | 3 | 4 |
Series of Business Acquisitions | All Other |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of businesses acquired | segment_business |  | 6 | 11 |
G & K Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Consideration transferred | $ 2,112,811,000 |  |  |
Share price of acquisition (in dollars per share) | $ / shares | $ 97.50 |  |  |
Net consideration transferred | $ 2,078,418,000 |  |  |
Goodwill deductible for tax purposes | 0 |  |  |
Cash consideration | $ 1,901,845,000 |  |  |
G & K Services | Service contracts |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Amortization Period (in years) |  | 15 years |  |
G & K Services | Level 3 | Measurement Input, Discount Rate |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Discount rate (as a percent) | 0.095 |  |  |
G & K Services | Real Property |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value of property plant and equipment | $ 141,800,000 |  |  |
G & K Services | Personal Property |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value of property plant and equipment | $ 111,500,000 |  |  |

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