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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Aug. 31, 2018 | Aug. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Deferred commissions current | $ 65.3 |
Deferred commissions noncurrent | 194.4 |
Amortization of deferred commissions | $ 17.1 |
Revenue Recognized under Topic 840 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Concentration risk (as a percent) | 100.00% | 100.00%
Uniform Rental and Facility Services | Revenue Recognized under Topic 840 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Concentration risk (as a percent) | 81.00% | 81.40%
Uniform Rental and Facility Services | Transferred over Time | Revenue Recognized under Topic 840 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Concentration risk (as a percent) | 95.90% |
First Aid and Safety Services | Revenue Recognized under Topic 840 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Concentration risk (as a percent) | 9.00% | 8.70%
First Aid and Safety Services | Transferred over Time | Revenue Recognized under Topic 840 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Concentration risk (as a percent) | 90.80% |
Fire Protection Services | Revenue Recognized under Topic 840 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Concentration risk (as a percent) | 5.80% | 5.40%
Fire Protection Services | Transferred over Time | Revenue Recognized under Topic 840 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Concentration risk (as a percent) | 100.00% |
Uniform Direct Sales | Revenue Recognized under Topic 840 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Concentration risk (as a percent) | 4.20% | 4.50%
Uniform Direct Sales | Transferred at Point in Time | Revenue Recognized under Topic 840 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Concentration risk (as a percent) | 94.70% |
Uniform Rental and Facility Services, First Aid and Safety Services and Fire Protection Services | Sales Revenue, Net [Member] |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Concentration risk (as a percent) | 95.00% |
Uniform Direct Sales | Sales Revenue, Net [Member] |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Concentration risk (as a percent) | 5.00% |

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