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Revenue Recognition - Schedule of Sources of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Aug. 31, 2019 | Aug. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 1,811,139 | $ 1,697,975
Uniform Rental and Facility Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,454,527 | 1,374,938
First Aid and Safety Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 172,090 | 153,417
Fire Protection Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 110,126 | 98,109
Uniform Direct Sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 74,396 | $ 71,511
Revenue |  |
Disaggregation of Revenue [Line Items] |  |
Percentage of revenue | 100.00% | 100.00%
Revenue | Uniform Rental and Facility Services |  |
Disaggregation of Revenue [Line Items] |  |
Percentage of revenue | 80.30% | 81.00%
Revenue | First Aid and Safety Services |  |
Disaggregation of Revenue [Line Items] |  |
Percentage of revenue | 9.50% | 9.00%
Revenue | Fire Protection Services |  |
Disaggregation of Revenue [Line Items] |  |
Percentage of revenue | 6.10% | 5.80%
Revenue | Uniform Direct Sales |  |
Disaggregation of Revenue [Line Items] |  |
Percentage of revenue | 4.10% | 4.20%

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