CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Jul. 01, 2017	Apr. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Income Statement [Abstract]
Net sales	$ 354,982	$ 381,913	$ 410,053	$ 736,895	$ 850,632
Cost of sales	297,684	$ 317,779	341,490	615,463	711,219
Selling, general and administrative expenses	40,172		44,734	84,713	91,973
Amortization of intangible assets	1,352		1,379	2,731	2,986
Restructuring and other charges	4,416		880	12,596	5,870
Operating income	11,358		21,570	21,392	38,584
Interest expense, net	19,525		21,512	38,672	45,607
Loss (gain) on early extinguishment of debt, net	63		(51,273)	108	(72,886)
Other income, net	(96)		(1,644)	(323)	(1,090)
(Loss) income from continuing operations before income taxes	(8,134)		52,975	(17,065)	66,953
Income tax (benefit) expense	(6,283)		2,115	(6,522)	3,073
(Loss) income from continuing operations	(1,851)		50,860	(10,543)	63,880
Loss from discontinued operations, net of taxes	0		(3,304)	0	(5,121)
Net (loss) income	(1,851)		47,556	(10,543)	58,759
Other comprehensive income (loss):
Changes in pension and other employee benefit accounts, net of taxes	1,595		2,480	3,189	4,960
Currency translation adjustment, net	55		(157)	508	1,585
Total other comprehensive income	1,650		2,323	3,697	6,545
Comprehensive (loss) income	$ (201)		$ 49,879	$ (6,846)	$ 65,304
(Loss) income per share – basic:
Continuing operations per share - basic	$ (0.22)		$ 5.97	$ (1.23)	$ 7.51
Discontinued operations per share - basic	0.00		(0.39)	0.00	(0.60)
Net (loss) income per share - basic	(0.22)		5.58	(1.23)	6.91
(Loss) income per share – diluted:
Continuing operations per share - diluted	(0.22)		5.15	(1.23)	6.43
Discontinued operations per share - diluted	0.00		(0.33)	0.00	(0.51)
Net (loss) income per share - diluted	$ (0.22)		$ 4.82	$ (1.23)	$ 5.92
Weighted average shares outstanding:
Basic shares	8,561		8,517	8,557	8,501
Diluted shares	8,561		9,977	8,557	10,143