Summary of Significant Accounting Policies - Sales to U.S. Government and its Agencies (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 29, 2012	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011
Concentration Risk [Line Items]
U.S. Government Sales	$ 485.3	$ 367.5	$ 286.6	$ 243.7	$ 298.2	$ 244.9	$ 249.9	$ 201.9	$ 1,383.1	$ 994.9	$ 918.1
U.S. Government and agencies [Member]
Concentration Risk [Line Items]
U.S. Government Sales									$ 1,311.0	$ 936.9	$ 855.8
Percent of Net Sales									95.00%	94.00%	93.00%