Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Income Tax Contingency [Line Items]
Other assets	$ 78,352,000	$ 61,964,000
Pool of excess tax benefits	10,800,000	7,300,000	9,600,000
Tax benefit recorded to additional pain-in-capital related to exercise of stock options and vesting of restricted shares	4,300,000	1,100,000
Valuation Allowance, Deferred Tax Asset, Change in Amount	1,205,000
Deferred Tax Assets, Valuation Allowance	5,866,000	7,071,000
Earnings of non-U.S. subsidiaries considered indefinitely reinvested	$ 271,000,000