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Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Millions | Aug. 31, 2025 | May 31, 2025
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted and unrestricted cash equivalents | $ 360.9 | $ 663.4
Available-for-sale securities | 4,976.8 | 3,755.5
Other | 37.3 | 34.5
Other long-term liabilities | 37.3 | 34.5
Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 167.1 | 159.2
Corporate Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted and unrestricted cash equivalents | 7.5 | 4.7
Available-for-sale securities | 1,937.6 | 1,644.0
Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted and unrestricted cash equivalents | 0.8 | 0.4
Available-for-sale securities | 941.0 | 973.5
U.S. Government Agency And Treasury Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted and unrestricted cash equivalents | 284.9 | 615.5
Available-for-sale securities | 1,106.5 | 978.8
Money Market Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted and unrestricted cash equivalents | 67.7 | 42.8
VRDNs [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 824.6 |
Quoted Prices in Active Markets (Level 1) [Member] | Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted and unrestricted cash equivalents | 67.7 | 42.8
Other | 37.3 | 34.5
Other long-term liabilities | 37.3 | 34.5
Quoted Prices in Active Markets (Level 1) [Member] | Money Market Securities [Member] | Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted and unrestricted cash equivalents | 67.7 | 42.8
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted and unrestricted cash equivalents | 293.2 | 620.6
Available-for-sale securities | 4,976.8 | 3,755.5
Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Securities [Member] | Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 167.1 | 159.2
Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member] | Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted and unrestricted cash equivalents | 7.5 | 4.7
Available-for-sale securities | 1,937.6 | 1,644.0
Significant Other Observable Inputs (Level 2) [Member] | Municipal Bonds [Member] | Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted and unrestricted cash equivalents | 0.8 | 0.4
Available-for-sale securities | 941.0 | 973.5
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Agency And Treasury Securities [Member] | Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted and unrestricted cash equivalents | 284.9 | 615.5
Available-for-sale securities | 1,106.5 | $ 978.8
Significant Other Observable Inputs (Level 2) [Member] | VRDNs [Member] | Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | $ 824.6 |

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