Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 30, 2012	Dec. 25, 2011
Income Tax Disclosure [Abstract]
Inventory	$ 5,390	$ 4,930
Accounts receivable	2,733	2,513
Capitalized research and development costs	21,173	18,476
Net operating loss and foreign tax credit carryforwards	65,951	62,685
Restructuring	491	2,537
Pension	12,874	7,890
Warranty	1,138	1,507
Deferred compensation	3,630	4,980
Stock based compensation	7,506	8,148
Depreciation	1,753	1,052
Other	11,759	12,349
Valuation allowance	(104,514)	(102,148)
Deferred tax assets	29,884	24,919
Deferred Revenue	546	1,316
Intangibles	8,327	9,542
Unremitted earnings	3,081	2,365
Deferred tax liabilities	11,954	13,223
Net deferred tax assets	$ 17,930	$ 11,696