Restructuring and Other Charges (Changes in Restructuring Liability) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Restructuring Reserve [Roll Forward]
Restructuring and other charges	$ 4,416	$ 880	$ 12,596	$ 5,870
Restructuring Reserve	23,570		23,570
Employee Severance Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other charges	143	300	1,239	966
Restructuring Reserve	1,393		1,393
Lease Termination Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other charges	1,183	118	1,237	158
Restructuring Reserve	983		983
Multi-Employer Pension Withdrawal Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other charges	337	297	5,532	566
Restructuring Reserve	21,186		21,186
Building Clean-up, Equipment Moving and Other Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other charges	999	$ 19	1,529	$ 1,458
Restructuring Reserve	8		8
2017 Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			2,000
Restructuring and other charges			9,867
Payments for Restructuring			(4,647)
Restructuring Reserve	7,220		7,220
2017 Plan [Member] | Employee Severance Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			2,000
Restructuring and other charges			1,478
Payments for Restructuring			(2,182)
Restructuring Reserve	1,296		1,296
2017 Plan [Member] | Lease Termination Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			0
Restructuring and other charges			1,219
Payments for Restructuring			(236)
Restructuring Reserve	983		983
2017 Plan [Member] | Multi-Employer Pension Withdrawal Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			0
Restructuring and other charges			4,933
Payments for Restructuring			0
Restructuring Reserve	4,933		4,933
2017 Plan [Member] | Building Clean-up, Equipment Moving and Other Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			0
Restructuring and other charges			2,237
Payments for Restructuring			(2,229)
Restructuring Reserve	8		8
2016 Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			844
Restructuring and other charges			169
Payments for Restructuring			(916)
Restructuring Reserve	97		97
2016 Plan [Member] | Employee Severance Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			844
Restructuring and other charges			(43)
Payments for Restructuring			(704)
Restructuring Reserve	97		97
2016 Plan [Member] | Lease Termination Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			0
Restructuring and other charges			18
Payments for Restructuring			(18)
Restructuring Reserve	0		0
2016 Plan [Member] | Multi-Employer Pension Withdrawal Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			0
Restructuring and other charges			0
Payments for Restructuring			0
Restructuring Reserve	0		0
2016 Plan [Member] | Building Clean-up, Equipment Moving and Other Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			0
Restructuring and other charges			194
Payments for Restructuring			(194)
Restructuring Reserve	0		0
Residual Plans [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			18,088
Restructuring and other charges			445
Payments for Restructuring			(2,280)
Restructuring Reserve	16,253		16,253
Residual Plans [Member] | Employee Severance Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			247
Restructuring and other charges			(196)
Payments for Restructuring			(51)
Restructuring Reserve	0		0
Residual Plans [Member] | Lease Termination Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			0
Restructuring and other charges			0
Payments for Restructuring			0
Restructuring Reserve	0		0
Residual Plans [Member] | Multi-Employer Pension Withdrawal Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			17,482
Restructuring and other charges			599
Payments for Restructuring			(1,828)
Restructuring Reserve	16,253		16,253
Residual Plans [Member] | Building Clean-up, Equipment Moving and Other Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			359
Restructuring and other charges			42
Payments for Restructuring			(401)
Restructuring Reserve	$ 0		$ 0