Quarterly Financial Data - Schedule of Quarterly Financial Data (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 29, 2012	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 485.3	$ 367.5	$ 286.6	$ 243.7	$ 298.2	$ 244.9	$ 249.9	$ 201.9	$ 1,383.1	$ 994.9	$ 918.1
Cost of sales (exclusive of items shown separately on Statement of Operations)	431.0	326.7	254.4	217.5	261.3	214.1	220.3	173.9	1,229.6	869.6	799.3
(Loss) income from continuing operations before income taxes	1.6	(9.0)	(9.6)	(9.2)	4.4	(0.5)	4.6	4.7	(26.2)	13.2	9.0
(Loss) income from continuing operations	(4.1)	197.6	(11.7)	(14.1)	(0.7)	(8.7)	1.3	2.4	167.7	(5.7)	2.9
Income (loss) from discontinued operations, net of income taxes	0.4	(0.2)	(0.1)	0.1	3.5	(0.8)	0.4		0.2	3.1
Net (loss) income	$ (3.7)	$ 197.4	$ (11.8)	$ (14.0)	$ 2.8	$ (9.5)	$ 1.7	$ 2.4	$ 167.9	$ (2.6)	$ 2.9
Basic (loss) income per share from continuing operations	$ (0.07)	$ 3.25	$ (0.20)	$ (0.24)					$ 2.76	$ (0.09)	$ 0.05
Basic and diluted income (loss) per share from continuing operations					$ (0.01)	$ (0.15)	$ 0.02	$ 0.04
Basic income per share from discontinued operations, net of income taxes	$ 0.01									$ 0.05
Basic and diluted income (loss) per share from discontinued operations, net of income taxes					$ 0.06	$ (0.01)	$ 0.01
Basic net (loss) income per share	$ (0.06)	$ 3.25	$ (0.20)	$ (0.24)					$ 2.76	$ (0.04)	$ 0.05
Basic and diluted net income (loss) per share					$ 0.05	$ (0.16)	$ 0.03	$ 0.04
Diluted (loss) income per share from continuing operations	$ (0.07)	$ 2.39	$ (0.20)	$ (0.24)					$ 2.11	$ (0.09)	$ 0.05
Diluted income per share from discontinued operations, net of income taxes	$ 0.01									$ 0.05
Diluted net (loss) income per share	$ (0.06)	$ 2.39	$ (0.20)	$ (0.24)					$ 2.11	$ (0.04)	$ 0.05