Commitments and Contingencies - Summary of Pre-Close Environmental Costs (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Aug. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Pre-Close Environmental Costs	$ 20.0
Amount spent through August 31, 2014	(16.9)
Amount included as a component of reserves for environmental remediation costs in the unaudited condensed consolidated balance sheet as of August 31, 2014	(3.1)
Remaining Pre-Close Environmental Costs	$ 0