Commitments and Contingencies - Summary of Pre-Close Environmental Costs (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Nov. 30, 2013
Commitments And Contingencies Disclosure [Abstract]
Pre-Close Environmental Costs	$ 20.0
Amount spent through November 30, 2013	(15.6)
Amount included as a component of reserves for environmental remediation costs in the consolidated balance sheet as of November 30, 2013	(2.9)
Remaining Pre-Close Environmental Costs	$ 1.5