Quarterly report pursuant to Section 13 or 15(d)

Description of Business, Basis of Presentation, and Significant Accounting Policies (Narrative) (Details)

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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