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Composition Of Certain Financial Statement Captions (Schedule Of Amortized Cost And Estimated Fair Value Of Short-Term And Long-Term Available-For-Sale Investments Based On Stated Maturities) (Details) (USD $)
In Thousands
Sep. 30, 2011
Sep. 24, 2010
Composition Of Certain Financial Statement Captions [Abstract]  
Amortized Cost, due within 1 year$ 390,559$ 289,082
Amortized Cost, due in 1 to 2 years213,487183,130
Amortized Cost, due in 2 to 3 years58,94718,301
Amortized Cost, total662,993490,513
Fair Value, due within 1 year391,281289,755
Fair Value, due in 1 to 2 years213,921184,891
Fair Value, due in 2 to 3 years58,87618,460
Fair Value, total$ 664,078$ 493,106