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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Effective income tax expense rate | 25.90% | 224.70% | 24.90% | 17.80%
Corporate income tax rate | 21.00% | 21.00% | 21.00% | 21.00%
Net favorable discrete tax | $ 300,000 |  |  |
Net of favorable discrete tax increase to deferred income tax liability withholding taxes on additional unremitted foreign earnings | 10,900,000 |  |  |
Favorable impact of net discrete tax benefits on relatively low level of pre-tax earnings |  | $ (12,700,000) |  | $ (12,700,000)
Discrete tax expense (benefit) |  | $ (8,100,000) |  | $ (16,500,000)
Deferred income tax liability | 29,700,000 |  | $ 29,700,000 |
Unremitted foreign earnings | 631,900,000 |  | 631,900,000 |
Provision for deferred income taxes | $ 0 |  | $ 0 |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiary and other recognized entity not within country of domicile. Includes, but is not limited to, other basis differences. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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