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
	Feb. 28, 2014	Feb. 28, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Favorable effect of the changes in contract estimates on loss from continuing operations before income taxes	$ (2.1)	$ (14.1)
Favorable effect of the changes in contract estimates on net loss	(2.1)	(14.0)
Favorable effect of the changes in contract estimates on basic and diluted loss per share	$ (0.03)	$ (0.24)
Contracts Accounted for Under Percentage-of-Completion [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Favorable effect of the changes in contract estimates on loss from continuing operations before income taxes	2.3	6.2
Favorable effect of the changes in contract estimates on net loss	$ 1.5	$ 3.6
Favorable effect of the changes in contract estimates on basic and diluted loss per share	$ 0.03	$ 0.06