Employee Benefit Plans (Obligations and Funded Status) (Details) (USD $)	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities	$ 1,176,000	$ 1,100,000
Change in plan assets
Employer contributions	6,411,000
Pension Benefits [Member]
Change in benefit obligations
Benefit obligation at beginning of year	286,212,000	283,063,000
Service cost	3,397,000	3,368,000	3,729,000
Interest cost	12,822,000	11,273,000	11,289,000
Benefit payments	(9,002,000)	(8,300,000)
Actuarial loss (gain)	50,550,000	(4,276,000)
Administrative expenses paid	(459,000)	(308,000)
Effect of foreign exchange	(16,636,000)	1,392,000
Benefit obligation at end of year	326,884,000	286,212,000	283,063,000
Change in plan assets
Fair value of plan assets at beginning of year	272,659,000	238,672,000
Actual return on plan assets	25,630,000	30,820,000
Employer contributions	6,874,000	9,570,000
Premiums paid	(459,000)	(308,000)
Effect of foreign exchange	(14,412,000)	2,205,000
Fair value of plan assets at end of year	281,290,000	272,659,000	238,672,000
Funded status
Net balance sheet liability	45,594,000	13,553,000
Non-current assets	61,000	2,738,000
Current liabilities	169,000	72,000
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	45,486,000	16,219,000
Supplemental Retirement Benefits [Member]
Change in benefit obligations
Benefit obligation at beginning of year	29,498,000	27,372,000
Service cost	758,000	643,000	640,000
Interest cost	1,009,000	708,000	892,000
Benefit payments	(722,000)	(726,000)
Actuarial loss (gain)	1,703,000	1,501,000
Administrative expenses paid	0	0
Effect of foreign exchange	0	0
Benefit obligation at end of year	32,246,000	29,498,000	27,372,000
Change in plan assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	722,000	726,000
Premiums paid	0	0
Effect of foreign exchange	0	0
Fair value of plan assets at end of year	0	0	0
Funded status
Net balance sheet liability	32,246,000	29,498,000
Non-current assets	0	0
Current liabilities	744,000	789,000
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	$ 31,502,000	$ 28,709,000