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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Deferred commissions current | $ 68.4 |  | $ 68.4 |
Deferred commissions noncurrent | 203.3 |  | 203.3 |
Amortization of deferred commissions | $ 18.0 |  | $ 52.7 |
Revenue Recognized under Topic 840 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Concentration risk (as a percent) | 100.00% | 100.00% | 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) | 80.70% | 80.80% | 80.90% | 81.20%
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) | 95.40% |  | 95.60% |
First Aid and Safety Services | Revenue Recognized under Topic 840 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Concentration risk (as a percent) | 8.90% | 8.70% | 8.90% | 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) | 90.60% |  | 90.70% |
Fire Protection Services | Revenue Recognized under Topic 840 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Concentration risk (as a percent) | 5.90% | 5.50% | 5.80% | 5.30%
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% |  | 100.00% |
Uniform Direct Sales | Revenue Recognized under Topic 840 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Concentration risk (as a percent) | 4.50% | 5.00% | 4.40% | 4.80%
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) | 96.30% |  | 96.40% |
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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