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		9 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2014	Aug. 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	$ (9.7)	$ 197.6	$ (61.2)	$ 171.8
(Unfavorable) favorable effect of the changes in contract estimates on net (loss) income	(9.5)	197.4	(61.8)	171.6
(Unfavorable) favorable effect of the changes in contract estimates on basic net (loss) income per share (in USD per share)	$ (0.17)	$ 3.25	$ (1.06)	$ 2.83
(Unfavorable) favorable effect of the changes in contract estimates on diluted net (loss) income per share (in USD per share)	$ (0.17)	$ 2.39	$ (1.06)	$ 2.13
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	(5.3)	11.0	(8.2)	20.4
(Unfavorable) favorable effect of the changes in contract estimates on net (loss) income	$ (2.3)	$ 9.5	$ (3.9)	$ 14.4
(Unfavorable) favorable effect of the changes in contract estimates on basic net (loss) income per share (in USD per share)	$ (0.04)	$ 0.16	$ (0.07)	$ 0.24
(Unfavorable) favorable effect of the changes in contract estimates on diluted net (loss) income per share (in USD per share)	$ (0.04)	$ 0.14	$ (0.07)	$ 0.24