Commitments and Contingencies - Summary of Northrop Agreement Activity (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Aug. 31, 2014
Contingencies And Commitments [Line Items]
Short-term receivable from Northrop	$ 6.0
Northrop [Member]
Contingencies And Commitments [Line Items]
Total reimbursable costs under the Northrop Agreement	189.7
Amount reimbursed to the Company through August 31, 2014	(105.7)
Potential future cost reimbursements available	84.0	[1]
Long-term receivable from Northrop in excess of the annual limitation included in the unaudited condensed consolidated balance sheet as of August 31, 2014	(74.0)
Amounts recoverable from Northrop in future periods included as a component of recoverable from the U.S. government and other third parties for environmental remediation costs in the unaudited condensed consolidated balance sheet as of August 31, 2014	(10.0)
Potential future recoverable amounts available under the Northrop Agreement	$ 0

[1] Includes the short-term receivable from Northrop of $6.0 million as of August 31, 2014.