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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2021 | May 31, 2020
Income Tax Contingency [Line Items] |  |
NOL carry forwards | $ 7.6 | $ 9.7
Reserve for uncertain tax positions | 20.4 | 26.5
Impact uncertain tax benefits, if recognized, on effective income tax rate | 20.4 | $ 26.5
Federal [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL carry forwards | $ 2.2 |
Federal [Member] | Minimum [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL carry forwards, Expiration date | May 31, 2022 |
Federal [Member] | Maximum [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL carry forwards, Expiration date | May 31, 2037 |
State [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL carry forwards | $ 5.4 |
State [Member] | Minimum [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL carry forwards, Expiration date | May 31, 2022 |
State [Member] | Maximum [Member] |  |
Income Tax Contingency [Line Items] |  |
NOL carry forwards, Expiration date | May 31, 2040 |

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