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