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Description of Business, Basis of Presentation, and Significant Accounting Policies (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2024 USD ($) Item | Nov. 30, 2023 USD ($) Item | Nov. 30, 2024 USD ($) Item Segment | Nov. 30, 2023 USD ($) Item | May 31, 2025 USD ($) | May 31, 2024 USD ($) Item
Accounting Policies [Line Items] |  |  |  |  |  |
Number of reportable segments | Segment |  |  | 1 |  |  |
Allowance for credit losses | $ 25.1 |  | $ 25.1 |  |  | $ 21.3
Advance collections | 1.3 |  | 1.3 |  |  | 0.7
Maximum individual health insurance claims liability |  |  |  |  |  | 0.5
Stock-based compensation costs recognized | $ 16.4 | $ 14.7 | $ 32.9 | $ 30.7 |  |
Change in accounting principle, accounting standards update, adopted [true false] | false |  | false |  |  |
Forecast [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Maximum individual health insurance claims liability |  |  |  |  | $ 0.5 |
Trade Receivables [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Receivables | $ 144.7 |  | $ 144.7 |  |  | 141.3
Purchased Receivables [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Receivables | $ 1,100.0 |  | $ 1,100.0 |  |  | $ 939.6
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 | 0 | 0 |  |
PEO Aggregate Claims Exceeding $1.0M [Member] | Minimum [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Individual workers' compensation claims liability |  |  |  |  |  | $ 1.0
PEO Aggregate Claims Exceeding $1.0M [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] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Maximum 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 |  |  |  |  | $ 1.0 |

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