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Income Taxes - Reconciliation from United States Statutory Federal Income Tax Rate to Effective Income Tax Rate (Detail) | 12 Months Ended
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May 31, 2020 | May 31, 2019 | May 31, 2018
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Federal income tax rate | 21.00% | 21.00% | 29.20%
State taxes, net of federal benefit | 0.80% | 1.00% | 0.80%
Foreign earnings | 5.90% | (1.10%) | (19.20%)
Foreign-derived intangible income benefit related to the Tax Act | (0.081) | 0 | 0
Transition tax related to the Tax Act | 0.00% | 0.00% | 43.30%
Remeasurement of deferred tax assets and liabilities related to the Tax Act | 0.00% | 0.00% | 3.70%
Excess tax benefits from share-based compensation | (7.20%) | (3.60%) | (5.30%)
Income tax audits and contingency reserves | (1.40%) | 1.30% | 2.90%
U.S. research and development tax credit | (1.80%) | (1.00%) | (0.60%)
Other, net | 2.90% | (1.50%) | 0.50%
EFFECTIVE INCOME TAX RATE | 12.10% | 16.10% | 55.30%
Withholding Taxes |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Foreign earnings | 6.50% |  |
Held For Sale Accounting Items |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Foreign earnings | 2.90% |  |
Statutory Rate Differences And Other Items |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Foreign earnings | (3.50%) |  |
Modification Of Treatment Of Certain Research And Development Expenditures |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Income tax audits and contingency reserves | (2.90%) |  |
Resolution Of IRS Audit And Other Matters |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Income tax audits and contingency reserves | 1.50% |  |
Intra-Entity Transfers Of Inventory |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Other, net | 2.30% |  |
Other Items |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Other, net | 0.60% |  |

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