Condensed Consolidating Financial Information - Condensed Consolidating Statements of Operations and Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013
Condensed Income Statements, Captions [Line Items]
Net sales	$ 403.1	$ 286.6	$ 732.8	$ 530.3
Cost of sales (exclusive of items shown separately below)	367.0	254.4	653.0	471.9
Selling, general and administrative	9.2	13.5	18.4	25.8
Depreciation and amortization	15.4	5.3	30.2	11.4
Interest expense	12.6	12.6	25.0	23.8
Other, net	48.5	10.4	55.9	16.2
Income (loss) from continuing operations before income taxes	(49.6)	(9.6)	(49.7)	(18.8)
Income tax (benefit) provision	(0.2)	2.1	1.8	7.0
(Loss) income from continuing operations	(49.4)	(11.7)	(51.5)	(25.8)
Income (loss) from discontinued operations	(0.8)	(0.1)	(0.8)	0
(Loss) income before equity income of subsidiaries	(50.2)	(11.8)	(52.3)	(25.8)
Equity income of subsidiaries	0	0	0	0
Net loss	(50.2)	(11.8)	(52.3)	(25.8)
Comprehensive (loss) income	(42.5)	11.1	(37.1)	20.0
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Net sales	0	0	0	0
Cost of sales (exclusive of items shown separately below)	(0.1)	(0.2)	(0.3)	(0.3)
Selling, general and administrative	0	0	0	0
Depreciation and amortization	0	0	0	0
Interest expense	0	0	0	0
Other, net	0.1	0.2	0.3	0.3
Income (loss) from continuing operations before income taxes	0	0	0	0
Income tax (benefit) provision	0	0	0	0
(Loss) income from continuing operations	0	0	0	0
Income (loss) from discontinued operations	0	0	0	0
(Loss) income before equity income of subsidiaries	0	0	0	0
Equity income of subsidiaries	(5.6)	(15.1)	(17.5)	(24.0)
Net loss	(5.6)	(15.1)	(17.5)	(24.0)
Comprehensive (loss) income	(10.8)	(31.3)	(27.8)	(56.4)
Parent [Member]
Condensed Income Statements, Captions [Line Items]
Net sales	0	0	0	0
Cost of sales (exclusive of items shown separately below)	0	0	0	0
Selling, general and administrative	3.4	8.3	5.6	16.6
Depreciation and amortization	0.1	0	0.1	0
Interest expense	11.9	12.0	23.6	22.6
Other, net	44.6	12.2	49.5	22.7
Income (loss) from continuing operations before income taxes	(60.0)	(32.5)	(78.8)	(61.9)
Income tax (benefit) provision	(5.0)	(5.7)	(9.8)	(12.1)
(Loss) income from continuing operations	(55.0)	(26.8)	(69.0)	(49.8)
Income (loss) from discontinued operations	(0.8)	(0.1)	(0.8)	0
(Loss) income before equity income of subsidiaries	(55.8)	(26.9)	(69.8)	(49.8)
Equity income of subsidiaries	5.6	15.1	17.5	24.0
Net loss	(50.2)	(11.8)	(52.3)	(25.8)
Comprehensive (loss) income	(42.5)	11.1	(37.1)	20.0
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Net sales	396.3	279.7	719.4	517.4
Cost of sales (exclusive of items shown separately below)	359.9	249.4	640.4	462.2
Selling, general and administrative	5.5	5.0	12.0	8.8
Depreciation and amortization	15.0	5.0	29.6	10.9
Interest expense	0.7	0.6	1.4	1.2
Other, net	4.2	(1.3)	7.2	(5.5)
Income (loss) from continuing operations before income taxes	11.0	21.0	28.8	39.8
Income tax (benefit) provision	5.1	8.5	11.5	20.8
(Loss) income from continuing operations	5.9	12.5	17.3	19.0
Income (loss) from discontinued operations	0	0	0	0
(Loss) income before equity income of subsidiaries	5.9	12.5	17.3	19.0
Equity income of subsidiaries	0	0	0	0
Net loss	5.9	12.5	17.3	19.0
Comprehensive (loss) income	11.1	28.7	27.6	51.4
Non-guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Net sales	6.8	6.9	13.4	12.9
Cost of sales (exclusive of items shown separately below)	7.2	5.2	12.9	10.0
Selling, general and administrative	0.3	0.2	0.8	0.4
Depreciation and amortization	0.3	0.3	0.5	0.5
Interest expense	0	0	0	0
Other, net	(0.4)	(0.7)	(1.1)	(1.3)
Income (loss) from continuing operations before income taxes	(0.6)	1.9	0.3	3.3
Income tax (benefit) provision	(0.3)	(0.7)	0.1	(1.7)
(Loss) income from continuing operations	(0.3)	2.6	0.2	5.0
Income (loss) from discontinued operations	0	0	0	0
(Loss) income before equity income of subsidiaries	(0.3)	2.6	0.2	5.0
Equity income of subsidiaries	0	0	0	0
Net loss	(0.3)	2.6	0.2	5.0
Comprehensive (loss) income	$ (0.3)	$ 2.6	$ 0.2	$ 5.0