Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 25, 2011	Dec. 26, 2010
Income Taxes [Abstract]
Inventory	$ 4,930	$ 4,817
Accounts receivable	2,513	1,296
Capitalized research and development costs	18,476	13,582
Net operating loss and foreign tax credit carryforwards	62,685	58,728
Restructuring	2,537	1,633
Deferred revenue	(1,316)	(105)
Pension	7,890	6,724
Warranty	1,507	1,469
Deferred compensation	4,980	2,306
Stock based compensation	8,148	6,740
Depreciation	1,052	2,501
Other	12,349	11,927
Valuation allowance	(102,148)	(37,808)
Deferred tax assets	23,603	73,810
Intangibles	9,542	10,447
Withholding tax liabilities	2,365	945
Deferred tax liabilities	11,907	11,392
Net deferred tax assets	$ 11,696	$ 62,418