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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2020 | Nov. 30, 2019 | May 31, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Deferred commissions, current | $ 78.7 |  | $ 78.7 |  | $ 76.2
Deferred commissions, noncurrent | 232.0 |  | 232.0 |  | $ 227.1
Amortization of deferred commissions | $ 20.7 | $ 19.2 | $ 41.1 | $ 38.0 |
Revenue |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Percentage of revenue | 100.00% | 100.00% | 100.00% | 100.00% |
Uniform Rental and Facility Services, First Aid and Safety Services and Fire Protection Services | Revenue |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Percentage of revenue |  |  | 95.00% |  |
Uniform Direct Sales | Revenue |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Percentage of revenue |  |  | 5.00% |  |

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