Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended
	Feb. 28, 2018	Nov. 30, 2017
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 125.0	$ 129.5
Unrecognized tax benefits that would impact effective tax rate in future	98.9	86.1
Accrued interest on unrecognized tax benefits	48.4	$ 48.3
Provisional estimate of impact of the Tax Act	163.7
Provisional estimate of impact of the Tax Act related to revaluation of deferred tax asset	108.3
Provisional estimate of impact of the Tax Act related to deemed repatriation of foreign earnings	$ 55.4