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Description of Business, Basis of Presentation, and Significant Accounting Policies (Narrative) (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 01, 2019 USD ($) | Feb. 29, 2020 USD ($) | Feb. 28, 2019 USD ($) | Feb. 29, 2020 USD ($) segment | Feb. 28, 2019 USD ($) | May 31, 2020 USD ($) | May 31, 2019 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  | 1 |  |  |
Allowance for doubtful accounts |  | $ 12.1 |  | $ 12.1 |  |  | $ 7.5
Advance collections |  | 8.1 |  | 8.1 |  |  | 4.2
Maximum individual health insurance claims liability |  |  |  |  |  |  | 0.3
Operating lease, impairment loss |  |  |  | 0.0 |  |  |
Stock-based compensation costs recognized |  | 12.7 | $ 10.8 | 36.5 | $ 33.6 |  |
Operating lease, right-of-use asset |  | 124.3 |  | 124.3 |  |  |
Operating lease, liability |  | 142.7 |  | 142.7 |  |  |
Forecast [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  | $ 1.0 |
Maximum individual health insurance claims liability |  |  |  |  |  | $ 0.3 |
ASU 2016-02 [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase in lease-related assets and liabilities | $ 116.4 |  |  |  |  |  |
Operating lease, right-of-use asset | 116.4 |  |  |  |  |  |
Operating lease, liability | 135.3 |  |  |  |  |  |
Unamortized landlord allowances and lease incentives | $ 18.9 |  |  |  |  |  |
Trade Receivables [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Receivables |  | 98.7 |  | 98.7 |  |  | 94.5
Purchased Receivables [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Receivables |  | $ 349.7 |  | $ 349.7 |  |  | 333.5
Minimum [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  |  | 0.5
Maximum [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  |  | $ 1.0
Europe [Member] | Revenue [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Total percentage |  | 1.00% | 1.00% | 1.00% | 1.00% |  |
Europe [Member] | Long Lived Assets [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Total percentage |  |  |  | 5.00% |  |  | 5.00%

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