v2.3.0.15

Composition Of Certain Financial Statement Captions (Schedule Of Gross Unrealized Losses And The Fair Value For Available-For-Sale Securities) (Details) (USD $) In Thousands	Sep. 30, 2011	Sep. 24, 2010
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	$ 171,076	$ 92,606
Gross Unrealized Losses, Less than 12 months	(543)	(29)
Fair Value, 12 months or greater	2,081
Gross Unrealized Losses, 12 months or greater	(3)
Fair Value	173,157	92,606
Gross Unrealized Losses	(546)	(29)
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	87,613
Gross Unrealized Losses, Less than 12 months	(487)
Fair Value	87,613
Gross Unrealized Losses	(487)
Municipal Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	79,466	62,494
Gross Unrealized Losses, Less than 12 months	(52)	(25)
Fair Value, 12 months or greater	2,081
Gross Unrealized Losses, 12 months or greater	(3)
Fair Value	81,547	62,494
Gross Unrealized Losses	(55)	(25)
U.S. Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	3,997	30,112
Gross Unrealized Losses, Less than 12 months	(4)	(4)
Fair Value	3,997	30,112
Gross Unrealized Losses	$ (4)	$ (4)

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