Income Taxes (Summary Of Tax Effects Of The Temporary Differences Between Carrying Amounts And Amounts Used For Tax) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 26, 2014	Sep. 27, 2013
Income Tax Disclosure [Abstract]
Investments	$ 2,033	$ 2,115
Accounts receivable	265	128
Inventories	3,607	4,255
Net operating loss	2,062	3,297
U.S. state taxes	209	225
Accrued expenses	16,759	11,985
Stock-based compensation	30,455	29,428
Revenue recognition	55,453	59,505
Depreciation and amortization	4,423	0
Research and development credits	5,153	4,002
Foreign tax credits	2,854	3,512
Other	8,312	7,503
Total gross deferred income tax assets	131,585	125,955
Less: valuation allowance	0	0
Total deferred income tax assets	131,585	125,955
Translation adjustment	579	880
Intangibles	450	318
International earnings	1,960	1,782
Depreciation and amortization	0	1,028
Unrealized gain on investments	405	275
Deferred income tax assets, net	128,191	121,672
Current deferred income tax assets	86,445	84,238
Long-term deferred income tax assets, net	$ 41,746	$ 37,434