Condensed Consolidating Financial Information, (As Restated for fiscal 2014 and 2013) - Schedule of Condensed Consolidating Statements of Operations and Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Nov. 30, 2015	Aug. 31, 2015	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	May. 31, 2015	May. 31, 2014	Aug. 31, 2015	Aug. 31, 2014	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2013
Condensed Income Statements, Captions [Line Items]
Net sales	$ 486.5	$ 441.0	$ 457.8	$ 323.0	$ 443.6	$ 420.4	$ 406.6	$ 331.6	$ 780.8	$ 738.2	$ 1,221.8	$ 1,158.6	$ 1,708.3	$ 1,602.2	$ 1,378.1
Cost of sales (exclusive of items shown separately below)													1,491.6
Cost of sales (exclusive of items shown separately below)	428.3	373.1	372.7	285.4	373.9	375.8	369.0	287.5	658.1	656.5	1,031.2	1,032.3	1,459.5	1,406.2	1,234.3
Selling, general and administrative		11.5	13.6	15.6	9.9	9.8	8.9	9.6	29.2	18.5	40.7	28.3	49.0	38.2	53.6
Depreciation and amortization		16.1	16.1	16.3	17.3	15.7	15.8	14.9	32.4	30.7	48.5	46.4	65.1	63.7	43.5
Interest expense		11.9	13.2	13.4	13.7	14.0	12.6	12.4	26.6	25.0	38.5	39.0	50.4	52.7	48.7
Other, net													69.0	74.4	33.7
(Loss) income from continuing operations before income taxes	15.5	(60.2)	37.2	(9.3)	26.6	(11.2)	(48.2)	(0.2)	27.9	(48.4)	(32.3)	(59.6)	(16.8)	(33.0)	(35.7)
Income tax (benefit) provision		(21.7)	19.9	(5.8)	14.6	(0.5)	0.2	2.0	14.1	2.2	(7.6)	1.7	0.3	16.3	(198.4)
(Loss) income from continuing operations	7.6	(38.5)	17.3	(3.5)	12.0	(10.7)	(48.4)	(2.2)	13.8	(50.6)	(24.7)	(61.3)	(17.1)	(49.3)	162.7
(Loss) income from discontinued operations, net of income taxes	0.1	0.6	0.0	0.2	(0.1)	0.2	(0.8)	0.0	0.2	(0.8)	0.8	(0.6)	0.9	(0.7)	0.2
(Loss) income before equity income of subsidiaries													(16.2)	(50.0)	162.9
Equity income of subsidiaries													0.0	0.0	0.0
Net (loss) income	$ 7.7	(37.9)	17.3	(3.3)	11.9	(10.5)	(49.2)	(2.2)	14.0	(51.4)	(23.9)	(61.9)	(16.2)	(50.0)	162.9
Comprehensive (loss) income		(26.1)	29.6	8.8	(116.7)	(2.8)	(41.4)	5.5	38.4	(35.9)	12.3	(38.7)	(24.2)	(155.4)	420.9
As Reported [Member]
Condensed Income Statements, Captions [Line Items]
Net sales		440.5	456.9	318.6	439.6	421.2	404.5	332.1	775.5	736.6	1,216.0	1,157.8		1,597.4	1,383.1
Cost of sales (exclusive of items shown separately below)		373.3	370.3	282.8	373.7	376.5	369.4	288.5	653.1	657.9	1,026.4	1,034.4		1,408.1	1,229.6
Selling, general and administrative		11.5	12.6	15.5	9.8	9.7	9.2	9.2	28.1	18.4	39.6	28.1		37.9	53.6
Depreciation and amortization		16.1	16.1	16.0	17.3	15.8	15.7	14.9	32.1	30.6	48.2	46.4		63.7	43.8
Interest expense		11.9	13.2	13.4	13.7	14.0	12.6	12.4	26.6	25.0	38.5	39.0		52.7	48.7
Other, net														74.4	33.6
(Loss) income from continuing operations before income taxes		(60.9)	39.7	(10.7)	22.9	(11.1)	(50.7)	(0.5)	29.0	(51.2)	(31.9)	(62.3)		(39.4)	(26.2)
Income tax (benefit) provision		(22.2)	21.3	(6.6)	12.7	(1.0)	(0.6)	1.8	14.7	1.2	(7.5)	0.2		12.9	(193.9)
(Loss) income from continuing operations		(38.7)	18.4	(4.1)	10.2	(10.1)	(50.1)	(2.3)	14.3	(52.4)	(24.4)	(62.5)		(52.3)	167.7
(Loss) income from discontinued operations, net of income taxes		0.6	0.0	0.2	(0.1)	0.2	(0.8)	0.0	0.2	(0.8)	0.8	(0.6)		(0.7)	0.2
(Loss) income before equity income of subsidiaries														(53.0)	167.9
Equity income of subsidiaries														0.0	0.0
Net (loss) income		(38.1)	18.4	(3.9)	10.1	(9.9)	(50.9)	(2.3)	14.5	(53.2)	(23.6)	(63.1)		(53.0)	167.9
Comprehensive (loss) income		$ (26.5)	$ 30.6	$ 8.3	$ (124.4)	$ (2.4)	$ (43.2)	$ 5.2	$ 38.9	$ (38.0)	$ 12.4	$ (40.4)		(164.8)	431.8
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Net sales													0.0	0.0	0.0
Cost of sales (exclusive of items shown separately below)													(0.6)
Cost of sales (exclusive of items shown separately below)														(0.5)	(0.6)
Selling, general and administrative													0.0	0.0	0.0
Depreciation and amortization													0.0	0.0	0.0
Interest expense													0.0	0.0	0.0
Other, net													0.6	0.5	0.6
(Loss) income from continuing operations before income taxes													0.0	0.0	0.0
Income tax (benefit) provision													0.0	0.0	0.0
(Loss) income from continuing operations													0.0	0.0	0.0
(Loss) income from discontinued operations, net of income taxes													0.0	0.0	0.0
(Loss) income before equity income of subsidiaries													0.0	0.0	0.0
Equity income of subsidiaries													(36.1)	(64.5)	(191.1)
Net (loss) income													(36.1)	(64.5)	(191.1)
Comprehensive (loss) income													(28.2)	23.1	(381.1)
Eliminations [Member] | As Reported [Member]
Condensed Income Statements, Captions [Line Items]
Net sales														0.0	0.0
Cost of sales (exclusive of items shown separately below)														(0.5)	(0.6)
Selling, general and administrative														0.0	0.0
Depreciation and amortization														0.0	0.0
Interest expense														0.0	0.0
Other, net														0.5	0.6
(Loss) income 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
(Loss) income from discontinued operations, net of income taxes														0.0	0.0
(Loss) income before equity income of subsidiaries														0.0	0.0
Equity income of subsidiaries														(61.2)	(196.1)
Net (loss) income														(61.2)	(196.1)
Comprehensive (loss) income														31.4	(390.7)
Parent [Member]
Condensed Income Statements, Captions [Line Items]
Net sales													0.0	0.0	0.0
Cost of sales (exclusive of items shown separately below)													0.0
Cost of sales (exclusive of items shown separately below)														0.0	0.0
Selling, general and administrative													23.8	12.8	31.1
Depreciation and amortization													0.1	0.1	0.1
Interest expense													48.0	50.1	46.2
Other, net													12.4	59.1	32.8
(Loss) income from continuing operations before income taxes													(84.3)	(122.1)	(110.2)
Income tax (benefit) provision													(31.1)	(8.3)	(81.8)
(Loss) income from continuing operations													(53.2)	(113.8)	(28.4)
(Loss) income from discontinued operations, net of income taxes													0.9	(0.7)	0.2
(Loss) income before equity income of subsidiaries													(52.3)	(114.5)	(28.2)
Equity income of subsidiaries													36.1	64.5	191.1
Net (loss) income													(16.2)	(50.0)	162.9
Comprehensive (loss) income													(24.2)	(155.4)	420.9
Parent [Member] | As Reported [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														12.6	31.1
Depreciation and amortization														0.1	0.1
Interest expense														50.1	46.2
Other, net														59.1	32.8
(Loss) income from continuing operations before income taxes														(121.9)	(110.2)
Income tax (benefit) provision														(8.4)	(81.8)
(Loss) income from continuing operations														(113.5)	(28.4)
(Loss) income from discontinued operations, net of income taxes														(0.7)	0.2
(Loss) income before equity income of subsidiaries														(114.2)	(28.2)
Equity income of subsidiaries														61.2	196.1
Net (loss) income														(53.0)	167.9
Comprehensive (loss) income														(164.8)	431.8
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Net sales													1,667.7	1,575.7	1,349.7
Cost of sales (exclusive of items shown separately below)													1,462.6
Cost of sales (exclusive of items shown separately below)														1,382.8	1,211.0
Selling, general and administrative													23.4	23.8	21.2
Depreciation and amortization													64.0	62.5	42.3
Interest expense													2.4	2.6	2.5
Other, net													58.0	18.5	2.9
(Loss) income from continuing operations before income taxes													57.3	85.5	69.8
Income tax (benefit) provision													27.5	22.9	(106.3)
(Loss) income from continuing operations													29.8	62.6	176.1
(Loss) income from discontinued operations, net of income taxes													0.0	0.0	0.0
(Loss) income before equity income of subsidiaries													29.8	62.6	176.1
Equity income of subsidiaries													0.0	0.0	0.0
Net (loss) income													29.8	62.6	176.1
Comprehensive (loss) income													21.9	(25.0)	366.1
Guarantor Subsidiaries [Member] | As Reported [Member]
Condensed Income Statements, Captions [Line Items]
Net sales														1,570.9	1,354.7
Cost of sales (exclusive of items shown separately below)														1,384.7	1,206.3
Selling, general and administrative														23.7	21.2
Depreciation and amortization														62.5	42.6
Interest expense														2.6	2.5
Other, net														18.5	2.8
(Loss) income from continuing operations before income taxes														78.9	79.3
Income tax (benefit) provision														19.6	(101.8)
(Loss) income from continuing operations														59.3	181.1
(Loss) income from discontinued operations, net of income taxes														0.0	0.0
(Loss) income before equity income of subsidiaries														59.3	181.1
Equity income of subsidiaries														0.0	0.0
Net (loss) income														59.3	181.1
Comprehensive (loss) income														(33.3)	375.7
Non-guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Net sales													40.6	26.5	28.4
Cost of sales (exclusive of items shown separately below)													29.6
Cost of sales (exclusive of items shown separately below)														23.9	23.9
Selling, general and administrative													1.8	1.6	1.3
Depreciation and amortization													1.0	1.1	1.1
Interest expense													0.0	0.0	0.0
Other, net													(2.0)	(3.7)	(2.6)
(Loss) income from continuing operations before income taxes													10.2	3.6	4.7
Income tax (benefit) provision													3.9	1.7	(10.3)
(Loss) income from continuing operations													6.3	1.9	15.0
(Loss) income from discontinued operations, net of income taxes													0.0	0.0	0.0
(Loss) income before equity income of subsidiaries													6.3	1.9	15.0
Equity income of subsidiaries													0.0	0.0	0.0
Net (loss) income													6.3	1.9	15.0
Comprehensive (loss) income													$ 6.3	1.9	15.0
Non-guarantor Subsidiaries [Member] | As Reported [Member]
Condensed Income Statements, Captions [Line Items]
Net sales														26.5	28.4
Cost of sales (exclusive of items shown separately below)														23.9	23.9
Selling, general and administrative														1.6	1.3
Depreciation and amortization														1.1	1.1
Interest expense														0.0	0.0
Other, net														(3.7)	(2.6)
(Loss) income from continuing operations before income taxes														3.6	4.7
Income tax (benefit) provision														1.7	(10.3)
(Loss) income from continuing operations														1.9	15.0
(Loss) income from discontinued operations, net of income taxes														0.0	0.0
(Loss) income before equity income of subsidiaries														1.9	15.0
Equity income of subsidiaries														0.0	0.0
Net (loss) income														1.9	15.0
Comprehensive (loss) income														$ 1.9	$ 15.0