Funds Held for Clients and Corporate Investments (Narrative) (Details) $ in Millions	12 Months Ended
May 31, 2026 USD ($) Security	May 31, 2025 USD ($) Security
Schedule of Available-for-sale Securities [Line Items]
Net unrealized losses on available-for-sale securities	$ (52.5)	$ (53.6)
Number of available-for-sale securities in an unrealized loss position \| Security	664	600
Percentage of available-for-sale securities in an unrealized loss position	60.00%	50.00%
Gross unrealized losses on available-for-sale securities	$ 59.8	$ 68.0
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on available-for-sale securities	$ 18.8	7.0
Corporate Bonds [Member] \| Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities maturity date	Jun. 03, 2026
Corporate Bonds [Member] \| Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities maturity date	Apr. 17, 2036
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on available-for-sale securities	$ 21.1	$ 44.3
Municipal Bonds [Member] \| Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities maturity date	Jun. 01, 2026
Municipal Bonds [Member] \| Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities maturity date	Dec. 01, 2032
Variable Rate Demand Notes [Member] \| Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities contractual maturities	20 years
Variable Rate Demand Notes [Member] \| Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities contractual maturities	30 years

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