Income Taxes (Unrecognized Tax Benefits) (Details) (USD $)	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Income Tax Contingency [Line Items]
Decrease in unrecognized tax benefits	$ (16,200,000)
Unrecognized tax benefits that would impact effective tax rate favorably, if recognized		32,300,000	17,012,000
Decrease in unrecognized tax benefits, that if recognized would impact the effective tax rate	15,288,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	10,700,000
unrecognized tax benefit (settlement of audit)	600,000
Reconciliation of unrecognized tax benefits
Beginning balance	18,475,000	30,996,000	27,976,000
Additions, Tax positions for current year	1,700,000	2,009,000	1,907,000
Additions, Tax positions for prior years	18,502,000	1,709,000	4,196,000
Reductions, Tax positions for current year	0	0	0
Reductions, Tax positions for prior years	3,722,000	(732,000)	(28,000)
Reductions, Settlements	308,000	(15,246,000)	(3,055,000)
Reductions, Expiration of statute of limitations	20,000	(261,000)	0
Ending balance	34,627,000	18,475,000	30,996,000
Unrecognized tax benefits, income tax interest accrued
Interest related to unrecognized income tax benefits		$ 1,400,000	$ 691,000