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Income Taxes (Reconciliation of U.S. Federal Statutory Tax Rate) (Details) | 12 Months Ended
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May 31, 2019 | May 31, 2018 | May 31, 2017
Income Taxes [Abstract] |  |  |
Federal statutory tax rate | 21.00% | 29.20% | 35.00%
Increase/(decrease) resulting from: |  |  |
Statutory tax rate reduction resulting from the Tax Act |  | (2.00%) |
State income taxes, net of federal tax benefit | 4.30% | 3.00% | 2.80%
Section 199 - Qualified production activities |  | (0.30%) | (0.50%)
Tax-exempt municipal bond interest | (0.50%) | (1.10%) | (1.30%)
Stock option windfall benefit | (0.50%) | (0.80%) | (1.50%)
Other items, including adoption of ASC 606 | 0.10% | (4.50%) | (0.10%)
Effective income tax rate | 24.40% | 23.50% | 34.40%

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