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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2023 | May 31, 2022
Income Tax Contingency [Line Items] |  |
NOL carry forwards | $ 5.1 | $ 5.6
Reserve for uncertain tax positions | 69.4 | 48.2
Impact uncertain tax benefits, if recognized, on effective income tax rate | 69.4 | $ 48.2
Federal [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL carry forwards | $ 0.3 |
Federal [Member] | Minimum [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL carry forwards, Expiration date | May 31, 2028 |
Federal [Member] | Maximum [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL carry forwards, Expiration date | May 31, 2030 |
State [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL carry forwards | $ 4.4 |
State [Member] | Minimum [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL carry forwards, Expiration date | May 31, 2024 |
State [Member] | Maximum [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL carry forwards, Expiration date | May 31, 2042 |
Foreign [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL carry forwards | $ 0.4 |

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