Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Income Tax Examination [Line Items]
Effective income tax rate reconciliation, tax credit, amount	$ 6.6	$ 10.0	$ 17.3	$ 20.7
Effective income tax rate reconciliation, tax settlement, foreign, amount	4.6
Effective income tax rate reconciliation, prior year income taxes, amount	1.2		1.2
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations			6.8	11.3
Domestic Tax Authority
Income Tax Examination [Line Items]
Shares issued, tax benefit	$ 0.8		9.4
Effective income tax rate reconciliation, tax credit, research, amount				2.8
Foreign Tax Authority
Income Tax Examination [Line Items]
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, amount			$ 0.1	6.4
Change in enacted tax rate				$ 1.0