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Income Taxes (Reconciliation of U.S. Federal Statutory Tax Rate) (Details) | 12 Months Ended
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May 31, 2021 | May 31, 2020 | May 31, 2019
Income Taxes [Abstract] |  |  |
Federal statutory tax rate | 21.00% | 21.00% | 21.00%
Increase/(decrease) resulting from: |  |  |
State income taxes, net of federal tax benefit | 4.30% | 3.90% | 4.30%
Tax-exempt municipal bond interest | (0.30%) | (0.40%) | (0.50%)
Stock option windfall benefit | (1.30%) | (0.80%) | (0.50%)
Other items, including adoption of ASC 606 | (0.20%) | (0.10%) | 0.10%
Effective income tax rate | 23.50% | 23.60% | 24.40%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 + Details
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