CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Income Statement [Abstract]
Net sales	$ 498,935	$ 480,576	$ 479,410	$ 490,119	$ 509,873	$ 442,781	$ 406,540	$ 418,614	$ 1,949,040	$ 1,777,808	$ 1,738,293
Cost of sales									1,653,513	1,485,931	1,417,147
Selling, general and administrative expenses									217,530	206,085	182,980
Amortization of intangible assets									11,781	9,962	9,881
Restructuring and other charges									22,458	13,100	27,100
Impairment of intangible assets									0	33,367	0
Operating income	11,009	9,330	13,347	10,072	(15,681)	16,524	16,842	11,678	43,758	29,363	101,185
Gain on bargain purchase									0	(17,262)	0
Interest expense, net									106,798	112,677	114,755
Loss on early extinguishment of debt, net									27,449	11,324	12,487
Other income, net									(7,004)	(5,602)	(1,249)
Loss from continuing operations before income taxes									(83,485)	(71,774)	(24,808)
Income tax expense									2,834	13,753	55,720
Loss from continuing operations	(19,437)	(10,794)	(39,301)	(16,787)	(59,468)	13,427	(18,996)	(20,490)	(86,319)	(85,527)	(80,528)
Income from discontinued operations, net of taxes	938	(99)	664	953	1,791	13,492	113	1,345	2,456	16,741	641
Net loss	(18,499)	(10,893)	(38,637)	(15,834)	(57,677)	26,919	(18,883)	(19,145)	(83,863)	(68,786)	(79,887)
Other comprehensive income (loss):
Changes in pension and other employee benefit accounts, net of taxes									(56,576)	31,430	(7,986)
Currency translation adjustment									(1,321)	(4,529)	665
Comprehensive loss									$ (141,760)	$ (41,885)	$ (87,208)
(Loss) income per share – basic:
Continuing operations per share - basic	$ (0.29)	$ (0.16)	$ (0.59)	$ (0.25)	$ (0.90)	$ 0.21	$ (0.30)	$ (0.32)	$ (1.29)	$ (1.32)	$ (1.27)
Discontinued operations per share - basic	$ 0.02	$ 0.00	$ 0.01	$ 0.01	$ 0.03	$ 0.21	$ 0.00	$ 0.02	$ 0.04	$ 0.25	$ 0.01
Net loss per share - basic	$ (0.27)	$ (0.16)	$ (0.58)	$ (0.24)	$ (0.87)	$ 0.42	$ (0.30)	$ (0.30)	$ (1.25)	$ (1.07)	$ (1.26)
(Loss) income per share – diluted:
Continuing operations per share - diluted	$ (0.29)	$ (0.16)	$ (0.59)	$ (0.25)	$ (0.90)	$ 0.16	$ (0.30)	$ (0.32)	$ (1.29)	$ (1.32)	$ (1.27)
Discontinued operations per share - diluted	$ 0.02	$ 0.00	$ 0.01	$ 0.01	$ 0.03	$ 0.16	$ 0.00	$ 0.02	$ 0.04	$ 0.25	$ 0.01
Net loss per share - diluted	$ (0.27)	$ (0.16)	$ (0.58)	$ (0.24)	$ (0.87)	$ 0.32	$ (0.30)	$ (0.30)	$ (1.25)	$ (1.07)	$ (1.26)
Weighted average shares outstanding:
Basic shares									66,952	64,576	63,567
Diluted shares									66,952	64,576	63,567