Income Taxes - Additional Information (Detail) - USD ($)				3 Months Ended			9 Months Ended		12 Months Ended
	Jan. 01, 2018	Dec. 22, 2017	Dec. 21, 2017	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2019	Feb. 28, 2018	May 31, 2018
Income Tax Disclosure [Abstract]
Corporate income tax rate		21.00%	35.00%	21.00%	29.20%	35.00%	21.00%	29.20%
Corporate tax rate reduction effective date	Jan. 01, 2018
Percentage of blended rate	29.20%				29.20%
Provisional income tax expense (benefit)									$ 7,300,000
Provisional income tax expense (benefit) related to provisional re-measurement of deferred tax assets and liabilities									(15,700,000)
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
Discrete tax expense (benefit)				$ (8,100,000)			$ (16,500,000)
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
Effective income tax expense rate				224.70%	17.00%		17.80%	15.30%
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) related adjustment to net provisional estimate of tax Act					$ (1,400,000)
Discrete tax expense (benefits) recorded in connection with foreign tax credit planning and implementation of foreign legal entity restructuring								$ (27,000,000)
Deferred income tax liability				19,200,000			19,200,000		19,900,000
Remittance of foreign earnings									$ 549,800,000
Unremitted foreign earnings				423,400,000			423,400,000
Provision for deferred income taxes				$ 0			$ 0