Income Taxes - Additional Information (Detail) - USD ($) $ in Millions				3 Months Ended			9 Months Ended
	Jan. 01, 2018	Dec. 22, 2017	Dec. 21, 2017	Feb. 28, 2018	Nov. 30, 2017	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Income Tax Disclosure [Abstract]
Corporate income tax rate		21.00%	35.00%
Corporate tax rate reduction effective date	Jan. 01, 2018
Percentage of blended rate	29.20%
Discrete tax expense (benefit)				$ (1.4)	$ (27.0)		$ (1.4)
Provisional income tax expense (benefit)							(24.1)
Provisional income tax benefit for the partial reversal of existing deferred tax liabilities				44.1			44.1
Partially offset provisional charge for the transition tax on previously deferred foreign earnings							66.8
Provisional deferred tax liability adjustment				$ 44.1			$ 44.1
Effective income tax expense rate				(17.00%)		25.40%	15.30%	4.80%
Effective income tax rate excluding provisional (benefit)				(12.90%)			15.80%
Favorable discrete adjustment for excess tax benefits related to equity compensation								$ 11.5
Unremitted foreign earnings					$ 64.1
Deferred income tax liability				$ 20.0			$ 20.0
Preliminary estimate of foreign earnings, not considered to be permanently reinvested				$ 446.0			$ 446.0