Basis of Presentation and Nature of Operations - Schedule of Impact of Contracts in Progress on Statement of Operations (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013
Change in Accounting Estimate [Line Items]
(Unfavorable) favorable effect of the changes in contract estimates on loss from continuing operations before income taxes	$ (49.4)	$ (11.7)	$ (51.5)	$ (25.8)
(Unfavorable) favorable effect of the changes in contract estimates on net loss	(50.2)	(11.8)	(52.3)	(25.8)
(Unfavorable) favorable effect of the changes in contract estimates on basic and diluted loss per share	$ (0.87)	$ (0.20)	$ (0.89)	$ (0.43)
Contracts Accounted for Under Percentage-of-Completion [Member]
Change in Accounting Estimate [Line Items]
(Unfavorable) favorable effect of the changes in contract estimates on loss from continuing operations before income taxes	(5.2)	3.2	(2.9)	9.4
(Unfavorable) favorable effect of the changes in contract estimates on net loss	$ (3.1)	$ 1.3	$ (1.6)	$ 4.9
(Unfavorable) favorable effect of the changes in contract estimates on basic and diluted loss per share	$ (0.05)	$ 0.02	$ (0.03)	$ 0.08