Income Taxes (Reconciliation Between The Effective Tax Rate And The U.S. Federal Statutory Rate) (Details) (USD $)	12 Months Ended
	Dec. 27, 2014		Dec. 28, 2013		Dec. 29, 2012
Income Taxes [Abstract]
Loss (income) before provision for (recovery of) income taxes	$ 14,494,000		$ (6,498,000)		$ (282,958,000)
Federal statutory tax rate	35.00%		35.00%		35.00%
Income taxes at U.S. Federal statutory rate	5,073,000		(2,274,000)		(99,035,000)
Tax on intercompany transactions	1,510,000		18,135,000		104,757,000
Change in liability for unrecognized tax benefits	10,255,000		6,748,000		938,000
Non-deductible intangible asset amortization and impairment of goodwill and purchased intangible assets	6,666,000		10,603,000		104,421,000
Non-deductible stock-based compensation	3,892,000		5,487,000		5,370,000
Non-deductible items and other	583,000		852,000		6,283,000
Utilization of stock option related loss carry-forwards recorded in equity					17,622,000
State taxes	132,000		(1,332,000)		(50,000)
True-up of prior year taxes and tax credits	12,016,000	[1]	(4,230,000)	[1]	(12,259,000)	[1]
Federal credits	(1,232,000)		(6,344,000)		(23,689,000)
Investment tax credits, net	(10,268,000)		(23,276,000)		(19,193,000)
Foreign and other rate differential	(2,812,000)		(10,208,000)		(6,599,000)
Change in valuation allowance	(6,348,000)		36,346,000		(40,311,000)
Other changes to deferred taxes	(5,055,000)		(4,751,000)		(954,000)
Provision for (recovery of) income taxes	14,412,000		25,756,000		37,301,000
Amount included in true-up of prior year taxes and credits	$ 12,800,000

[1] In 2014, the amount included as true-up of prior year taxes and credits in the table above includes $12.8 million adjustments that have been offset with a change in valuation allowance.