Operating Segments and Related Disclosures - Sales to U.S. Government and its Agencies (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2014	Aug. 31, 2013
Revenue, Major Customer [Line Items]
Net sales	$ 419.5	$ 367.5	$ 1,152.3	$ 897.8
U. S. Government Sales [Member]
Revenue, Major Customer [Line Items]
Net sales	$ 395.8	$ 353.2	$ 1,090.1	$ 859.8
U. S. Government Sales [Member] | Sales Revenue, Net [Member] | Customers [Member]
Revenue, Major Customer [Line Items]
Percentage of Net Sales	94.00%	96.00%	95.00%	96.00%