Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	May 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Income Tax Examination [Line Items]
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations				$ 11.3	$ 6.8
Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount				6.4	8.6
Change in enacted tax rate				1.0
Domestic Tax Authority [Member]
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	$ 10.0	$ 1.1	$ 17.2	20.7	$ 18.3
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount				$ 2.8