Condensed Consolidating Financial Information - Condensed Consolidating Statements of Operations and Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Feb. 28, 2014	Feb. 28, 2013
Condensed Income Statements, Captions [Line Items]
Net sales	$ 329.7	$ 243.7
Cost of sales (exclusive of items shown separately below)	286.0	217.5
Selling, general and administrative	9.2	12.3
Depreciation and amortization	14.8	6.1
Interest expense	12.4	11.2
Other, net	7.4	5.8
Income (loss) from continuing operations before income taxes	(0.1)	(9.2)
Income tax (benefit) provision	2.0	4.9
Loss from continuing operations	(2.1)	(14.1)
Income from discontinued operations		0.1
(Loss) income before equity income of subsidiaries	(2.1)	(14.0)
Net loss	(2.1)	(14.0)
Comprehensive income	5.4	8.9
Parent [Member]
Condensed Income Statements, Captions [Line Items]
Net sales
Cost of sales (exclusive of items shown separately below)
Selling, general and administrative	2.2	8.3
Depreciation and amortization
Interest expense	11.7	10.6
Other, net	4.9	10.5
Income (loss) from continuing operations before income taxes	(18.8)	(29.4)
Income tax (benefit) provision	(4.8)	(6.4)
Loss from continuing operations	(14.0)	(23.0)
Income from discontinued operations		0.1
(Loss) income before equity income of subsidiaries	(14.0)	(22.9)
Equity income of subsidiaries	11.9	8.9
Net loss	(2.1)	(14.0)
Comprehensive income	5.4	8.9
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Net sales	323.1	237.7
Cost of sales (exclusive of items shown separately below)	280.5	212.9
Selling, general and administrative	6.5	3.9
Depreciation and amortization	14.6	5.8
Interest expense	0.7	0.6
Other, net	3.0	(4.4)
Income (loss) from continuing operations before income taxes	17.8	18.9
Income tax (benefit) provision	6.4	12.3
Loss from continuing operations	11.4	6.6
Income from discontinued operations
(Loss) income before equity income of subsidiaries	11.4	6.6
Equity income of subsidiaries
Net loss	11.4	6.6
Comprehensive income	16.5	22.7
Non-guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Net sales	6.6	6.0
Cost of sales (exclusive of items shown separately below)	5.7	4.8
Selling, general and administrative	0.5	0.1
Depreciation and amortization	0.2	0.3
Interest expense
Other, net	(0.7)	(0.5)
Income (loss) from continuing operations before income taxes	0.9	1.3
Income tax (benefit) provision	0.4	(1.0)
Loss from continuing operations	0.5	2.3
Income from discontinued operations
(Loss) income before equity income of subsidiaries	0.5	2.3
Equity income of subsidiaries
Net loss	0.5	2.3
Comprehensive income	0.5	2.3
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Net sales
Cost of sales (exclusive of items shown separately below)	(0.2)	(0.2)
Selling, general and administrative
Depreciation and amortization
Interest expense
Other, net	0.2	0.2
Income (loss) from continuing operations before income taxes
Income tax (benefit) provision
Loss from continuing operations
Income from discontinued operations
(Loss) income before equity income of subsidiaries
Equity income of subsidiaries	(11.9)	(8.9)
Net loss	(11.9)	(8.9)
Comprehensive income	$ (17.0)	$ (25.0)