Restructuring and Other Charges (Changes in Restructuring Liability) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Restructuring Reserve [Roll Forward]
Accruals, net	$ 22,458	$ 13,100	$ 27,100
Restructuring reserve, ending balance	22,150
Employee Separation Costs [Member]
Restructuring Reserve [Roll Forward]
Accruals, net	8,119	6,480	7,571
Restructuring reserve, ending balance	1,637
Lease Termination [Member]
Restructuring Reserve [Roll Forward]
Accruals, net	2,155	1,059	1,159
Restructuring reserve, ending balance	1,813
Pension Withdrawal Liabilities [Member]
Restructuring Reserve [Roll Forward]
Accruals, net	1,260	453	5,082
Restructuring reserve, ending balance	18,700
Building Clean-up, Equipment Moving and Other Expenses [Member]
Restructuring Reserve [Roll Forward]
Accruals, net	5,476	2,287	3,823
Restructuring reserve, ending balance	0
2014 Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0
Accruals, net	6,230
Payments	(4,724)
Restructuring reserve, ending balance	1,506
2014 Plan [Member] | Employee Separation Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0
Accruals, net	5,797
Payments	(4,291)
Restructuring reserve, ending balance	1,506
2014 Plan [Member] | Lease Termination [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0
Accruals, net	0
Payments	0
Restructuring reserve, ending balance	0
2014 Plan [Member] | Pension Withdrawal Liabilities [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0
Accruals, net	0
Payments	0
Restructuring reserve, ending balance	0
2014 Plan [Member] | Building Clean-up, Equipment Moving and Other Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0
Accruals, net	433
Payments	(433)
Restructuring reserve, ending balance	0
2013 Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	893	0
Accruals, net	947	6,867
Payments	(1,783)	(5,974)
Restructuring reserve, ending balance	57	893
2013 Plan [Member] | Employee Separation Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	837	0
Accruals, net	303	6,099
Payments	(1,086)	(5,262)
Restructuring reserve, ending balance	54	837
2013 Plan [Member] | Lease Termination [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	56	0
Accruals, net	172	392
Payments	(225)	(336)
Restructuring reserve, ending balance	3	56
2013 Plan [Member] | Pension Withdrawal Liabilities [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0	0
Accruals, net	0	0
Payments	0	0
Restructuring reserve, ending balance	0	0
2013 Plan [Member] | Building Clean-up, Equipment Moving and Other Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0	0
Accruals, net	472	376
Payments	(472)	(376)
Restructuring reserve, ending balance	0	0
2012 Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	5,727	7,092
Accruals, net	572	1,241
Payments	(606)	(2,606)
Restructuring reserve, ending balance	5,693	5,727
2012 Plan [Member] | Employee Separation Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0	1,199
Accruals, net	0	(86)
Payments	0	(1,113)
Restructuring reserve, ending balance	0	0
2012 Plan [Member] | Lease Termination [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	327	493
Accruals, net	(178)	311
Payments	(124)	(477)
Restructuring reserve, ending balance	25	327
2012 Plan [Member] | Pension Withdrawal Liabilities [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	5,400	5,400
Accruals, net	749	0
Payments	(481)	0
Restructuring reserve, ending balance	5,668	5,400
2012 Plan [Member] | Building Clean-up, Equipment Moving and Other Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0	0
Accruals, net	1	1,016
Payments	(1)	(1,016)
Restructuring reserve, ending balance	0	0
Residual Plans [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	16,172	21,663
Accruals, net	1,488	1,195
Payments	(3,979)	(6,686)
Restructuring reserve, ending balance	13,681	16,172
Residual Plans [Member] | Employee Separation Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0	127
Accruals, net	0	19
Payments	0	(146)
Restructuring reserve, ending balance	0	0
Residual Plans [Member] | Lease Termination [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	1,017	2,017
Accruals, net	212	319
Payments	(580)	(1,319)
Restructuring reserve, ending balance	649	1,017
Residual Plans [Member] | Pension Withdrawal Liabilities [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	15,155	19,519
Accruals, net	511	453
Payments	(2,634)	(4,817)
Restructuring reserve, ending balance	13,032	15,155
Residual Plans [Member] | Building Clean-up, Equipment Moving and Other Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0	0
Accruals, net	765	404
Payments	(765)	(404)
Restructuring reserve, ending balance	0	0
Acquisition Integration Plans [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	2,658	1,386
Accruals, net	11,216	2,502
Acquisition		1,985
Payments	(12,661)	(3,215)
Restructuring reserve, ending balance	1,213	2,658
Acquisition Integration Plans [Member] | Employee Separation Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	155	298
Accruals, net	2,019	448
Acquisition		0
Payments	(2,097)	(591)
Restructuring reserve, ending balance	77	155
Acquisition Integration Plans [Member] | Lease Termination [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	2,503	1,088
Accruals, net	1,949	37
Acquisition		1,985
Payments	(3,316)	(607)
Restructuring reserve, ending balance	1,136	2,503
Acquisition Integration Plans [Member] | Pension Withdrawal Liabilities [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0	0
Accruals, net	0	0
Acquisition		0
Payments	0	0
Restructuring reserve, ending balance	0	0
Acquisition Integration Plans [Member] | Building Clean-up, Equipment Moving and Other Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0	0
Accruals, net	7,248	2,017
Acquisition		0
Payments	(7,248)	(2,017)
Restructuring reserve, ending balance	$ 0	$ 0