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Income Taxes - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 22, 2017 | Dec. 21, 2017 | Feb. 28, 2019 | May 31, 2020 | May 31, 2019 | May 31, 2018
Income Tax [Line Items] |  |  |  |  |  |  |
Corporate income tax rate |  | 21.00% | 35.00% |  |  |  |
Corporate tax rate reduction effective date | Jan. 01, 2018 |  |  |  |  |  |
Percentage of blended rate | 29.20% |  |  |  |  |  |
Federal statutory rate |  |  |  |  | 21.00% |  |
Provisional income tax expense (benefit) |  |  |  |  |  | $ (8,100,000) | $ 7,300,000
Provisional income tax expense (benefit) related to provisional re-measurement of deferred tax assets and liabilities |  |  |  |  |  | (6,265,000) | (15,678,000)
Provisional income tax benefit for the partial reversal of existing deferred tax liabilities |  |  |  |  |  |  | 44,900,000
Provisional charge for the transition tax on previously deferred foreign earnings |  |  |  |  |  |  | 67,900,000
Income tax expense (benefit) related to re-measurement of deferred tax assets and liabilities |  |  |  |  |  | (6,300,000) |
Benefit from reduction of transition tax on unremitted earnings from foreign subsidiaries |  |  |  | $ 1,800,000 |  | (1,868,000) | 67,899,000
Foreign capital loss carryforwards |  |  |  |  | $ 29,000,000.0 |  |
Total Valuation Allowances |  |  |  |  | 66,855,000 | 55,274,000 |
Unrecognized tax benefits that would impact effective tax rate, if recognized |  |  |  |  | 8,600,000 | 7,700,000 | 13,600,000
Accrued interest and penalties related to unrecognized tax benefits |  |  |  |  | 2,900,000 | 3,000,000.0 | $ 2,800,000
Unremitted foreign earnings |  |  |  |  | 407,400,000 | 413,300,000 |
Deferred income tax liability |  |  |  |  | 8,781,000 | $ 18,795,000 |
Increase decrease in deferred tax liability |  |  |  |  | 12,100,000 |  |
Remaining unremitted foreign earnings |  |  |  |  | 905,100,000 |  |
Provision for deferred income taxes |  |  |  |  | 0 |  |
Capital Loss Carryforwards |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |
Tax credit carryforwards |  |  |  |  | 47,000,000.0 |  |
Tax credit carry forward amount subject to expiration |  |  |  |  | $ 43,400,000 |  |
Tax credit carryforwards expiration year |  |  |  |  | 2022 |  |
State |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  | $ 6,100,000 |  |
Net operating loss carryforwards beginning expiration year |  |  |  |  | 2021 |  |
Foreign |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |
Tax credit carryforwards |  |  |  |  | $ 23,400,000 |  |
Tax credit carryforwards expiration year |  |  |  |  | 2030 |  |
Foreign Net Operating Loss Carryforwards |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  | $ 152,500,000 |  |
Net operating loss carryforwards beginning expiration year |  |  |  |  | 2021 |  |
Net operating loss carryforwards subject to expiration |  |  |  |  | $ 8,300,000 |  |
Net operating loss carryforwards indefinite carry forward period |  |  |  |  | $ 144,200,000 |  |

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