Condensed Consolidating Financial Information (Condensed Consolidating Statement of Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jul. 01, 2017	Apr. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Condensed Financial Statements, Captions [Line Items]
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
Intercompany interest (income) expense	0		0	0	0
Loss (gain) on early extinguishment of debt, net	63		(51,273)	108	(72,886)
Other expense (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 before equity in (loss) income of subsidiaries	(1,851)		50,860	(10,543)	63,880
Equity in (loss) income of subsidiaries	0		0	0	0
(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):
Other comprehensive income (loss) of subsidiaries	0		0	0	0
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
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	0		0	0	0
Cost of sales	0		0	0	0
Selling, general and administrative expenses	0		0	0	0
Amortization of intangible assets	0		0	0	0
Restructuring and other charges	0		0	0	0
Operating income	0		0	0	0
Interest expense, net	0		0	0	0
Intercompany interest (income) expense	0		0	0	0
Loss (gain) on early extinguishment of debt, net	0		0	0	0
Other expense (income), net	0		0	0	0
(Loss) income from continuing operations before income taxes	0		0	0	0
Income tax (benefit) expense	0		0	0	0
(Loss) income from continuing operations before equity in (loss) income of subsidiaries	0		0	0	0
Equity in (loss) income of subsidiaries	(1,851)		47,556	(10,543)	58,759
(Loss) income from continuing operations			47,556		58,759
Loss from discontinued operations, net of taxes			0		0
Net (loss) income	(1,851)		47,556	(10,543)	58,759
Other comprehensive income (loss):
Other comprehensive income (loss) of subsidiaries	1,650		2,323	3,697	6,545
Changes in pension and other employee benefit accounts, net of taxes	0		0	0	0
Currency translation adjustment, net	0		0	0	0
Total other comprehensive income	1,650		2,323	3,697	6,545
Comprehensive (loss) income	(201)		49,879	(6,846)	65,304
Subsidiary Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	184,420		217,739	390,022	456,655
Cost of sales	165,513		193,924	347,312	405,073
Selling, general and administrative expenses	24,437		28,099	53,493	57,374
Amortization of intangible assets	148		152	297	304
Restructuring and other charges	3,089		759	11,077	3,777
Operating income	(8,767)		(5,195)	(22,157)	(9,873)
Interest expense, net	19,409		21,459	38,493	45,507
Intercompany interest (income) expense	(295)		(246)	(577)	(491)
Loss (gain) on early extinguishment of debt, net	63		(51,273)	108	(72,886)
Other expense (income), net	212		400	23	1,000
(Loss) income from continuing operations before income taxes	(28,156)		24,465	(60,204)	16,997
Income tax (benefit) expense	(6,440)		1,203	(6,921)	2,053
(Loss) income from continuing operations before equity in (loss) income of subsidiaries	(21,716)		23,262	(53,283)	14,944
Equity in (loss) income of subsidiaries	19,865		24,164	42,740	45,962
(Loss) income from continuing operations			47,426		60,906
Loss from discontinued operations, net of taxes			130		(2,147)
Net (loss) income	(1,851)		47,556	(10,543)	58,759
Other comprehensive income (loss):
Other comprehensive income (loss) of subsidiaries	145		(71)	688	2,038
Changes in pension and other employee benefit accounts, net of taxes	1,505		2,394	3,009	4,507
Currency translation adjustment, net	0		0	0	0
Total other comprehensive income	1,650		2,323	3,697	6,545
Comprehensive (loss) income	(201)		49,879	(6,846)	65,304
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	169,882		191,693	345,540	393,171
Cost of sales	132,171		147,566	268,151	306,146
Selling, general and administrative expenses	15,530		16,439	30,792	34,221
Amortization of intangible assets	1,102		1,116	2,221	2,460
Restructuring and other charges	1,327		121	1,519	2,093
Operating income	19,752		26,451	42,857	48,251
Interest expense, net	116		53	179	100
Intercompany interest (income) expense	295		246	577	491
Loss (gain) on early extinguishment of debt, net	0		0	0	0
Other expense (income), net	(331)		(1,962)	(439)	(1,948)
(Loss) income from continuing operations before income taxes	19,672		28,114	42,540	49,608
Income tax (benefit) expense	157		120	309	242
(Loss) income from continuing operations before equity in (loss) income of subsidiaries	19,515		27,994	42,231	49,366
Equity in (loss) income of subsidiaries	350		(1,091)	509	552
(Loss) income from continuing operations			26,903		49,918
Loss from discontinued operations, net of taxes			(2,739)		(3,956)
Net (loss) income	19,865		24,164	42,740	45,962
Other comprehensive income (loss):
Other comprehensive income (loss) of subsidiaries	93		(250)	814	(73)
Changes in pension and other employee benefit accounts, net of taxes	90		86	180	453
Currency translation adjustment, net	(38)		93	(306)	1,658
Total other comprehensive income	145		(71)	688	2,038
Comprehensive (loss) income	20,010		24,093	43,428	48,000
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	680		621	1,333	806
Cost of sales	0		0	0	0
Selling, general and administrative expenses	205		196	428	378
Amortization of intangible assets	102		111	213	222
Restructuring and other charges	0		0	0	0
Operating income	373		314	692	206
Interest expense, net	0		0	0	0
Intercompany interest (income) expense	0		0	0	0
Loss (gain) on early extinguishment of debt, net	0		0	0	0
Other expense (income), net	23		(82)	93	(142)
(Loss) income from continuing operations before income taxes	350		396	599	348
Income tax (benefit) expense	0		792	90	778
(Loss) income from continuing operations before equity in (loss) income of subsidiaries	350		(396)	509	(430)
Equity in (loss) income of subsidiaries	0		0	0	0
(Loss) income from continuing operations			(396)		(430)
Loss from discontinued operations, net of taxes			(695)		982
Net (loss) income	350		(1,091)	509	552
Other comprehensive income (loss):
Other comprehensive income (loss) of subsidiaries	0		0	0	0
Changes in pension and other employee benefit accounts, net of taxes	0		0	0	0
Currency translation adjustment, net	93		(250)	814	(73)
Total other comprehensive income	93		(250)	814	(73)
Comprehensive (loss) income	443		(1,341)	1,323	479
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	0		0	0	0
Cost of sales	0		0	0	0
Selling, general and administrative expenses	0		0	0	0
Amortization of intangible assets	0		0	0	0
Restructuring and other charges	0		0	0	0
Operating income	0		0	0	0
Interest expense, net	0		0	0	0
Intercompany interest (income) expense	0		0	0	0
Loss (gain) on early extinguishment of debt, net	0		0	0	0
Other expense (income), net	0		0	0	0
(Loss) income from continuing operations before income taxes	0		0	0	0
Income tax (benefit) expense	0		0	0	0
(Loss) income from continuing operations before equity in (loss) income of subsidiaries	0		0	0	0
Equity in (loss) income of subsidiaries	(18,364)		(70,629)	(32,706)	(105,273)
(Loss) income from continuing operations			(70,629)		(105,273)
Loss from discontinued operations, net of taxes			0		0
Net (loss) income	(18,364)		(70,629)	(32,706)	(105,273)
Other comprehensive income (loss):
Other comprehensive income (loss) of subsidiaries	(1,888)		(2,002)	(5,199)	(8,510)
Changes in pension and other employee benefit accounts, net of taxes	0		0	0	0
Currency translation adjustment, net	0		0	0	0
Total other comprehensive income	(1,888)		(2,002)	(5,199)	(8,510)
Comprehensive (loss) income	$ (20,252)		$ (72,631)	$ (37,905)	$ (113,783)