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v3.21.2

Description of Business, Basis of Presentation, and Significant Accounting Policies (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2021 USD ($) item segment | Aug. 31, 2020 USD ($) item | May 31, 2022 USD ($) | May 31, 2021 USD ($) item
Accounting Policies [Line Items] |  |  |  |
Number of reportable segments | segment | 1 |  |  |
Allowance for doubtful accounts | $ 12.1 |  |  | $ 16.0
Advance collections | 4.6 |  |  | 2.5
Maximum individual health insurance claims liability |  |  |  | 0.3
Stock-based compensation costs recognized | 12.4 | $ 13.3 |  |
Forecast [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Maximum individual health insurance claims liability |  |  | $ 0.5 |
Trade Receivables [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Receivables | 105.9 |  |  | 98.4
Purchased Receivables [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Receivables | $ 480.3 |  |  | $ 495.9
Accounts And Unbilled Receivables [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Number of clients creating a credit concentration | item | 0 |  |  | 0
Revenue [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Number of clients creating a credit concentration | item | 0 | 0 |  |
PEO [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  | $ 1.0
PEO [Member] | Forecast [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Maximum individual workers' compensation claims liability |  |  | 1.0 |
PEO [Member] | Minimum [Member] | Forecast [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Individual workers' compensation claims liability |  |  | 1.0 |
PEO Aggregate Claims Exceeding $1.0M [Member] | Maximum [Member] | Forecast [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Maximum individual workers' compensation claims liability |  |  | $ 2.0 |

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