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Revenue Recognition - Schedule of Sources of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Aug. 31, 2018 | Aug. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Net Sales | $ 1,697,975 | $ 1,611,503
Uniform Rental and Facility Services |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 1,374,938 | 1,311,784
First Aid and Safety Services |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 153,417 | 140,582
Fire Protection Services |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | 98,109 | 86,547
Uniform Direct Sales |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | $ 71,511 | $ 72,590
Revenue Recognized under Topic 840 |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 100.00% | 100.00%
Revenue Recognized under Topic 840 | Uniform Rental and Facility Services |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 81.00% | 81.40%
Revenue Recognized under Topic 840 | First Aid and Safety Services |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 9.00% | 8.70%
Revenue Recognized under Topic 840 | Fire Protection Services |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 5.80% | 5.40%
Revenue Recognized under Topic 840 | Uniform Direct Sales |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 4.20% | 4.50%

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