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Short-Term Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 01, 2016
Oct. 03, 2015
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale securities: Cost Basis $ 40,393 $ 192,609
Available-for-sale securities: Unrealized Gains 5,213 2,301
Available-for-sale securities: Unrealized Losses 0 (2)
Available-for-sale securities, Fair Value 45,606 194,908
Available-for-sale Securities, Debt Maturities [Abstract]    
Due in less than 1 year, Amortized Cost 25,124 148,088
Due in less than 1 year, Estimated Fair Value 25,124 149,100
Due between 2 and 5 years, Amortized Cost [1] 0 29,252
Due between 2 and 5 years, Estimated Fair Value [1] 0 29,330
Proceeds from sale of available-for-sale securities 126,000 163,800
Cash and cash equivalents    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Cash and cash equivalents: Cost Basis 354,347 130,607
Cash and cash equivalents: Fair Value 354,347 130,607
Commercial paper    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale securities: Cost Basis 24,999 9,740
Available-for-sale securities: Unrealized Gains 0 0
Available-for-sale securities: Unrealized Losses 0 0
Available-for-sale securities, Fair Value 24,999 9,740
U.S. Treasury and agency obligations    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale securities: Cost Basis 125 149,708
Available-for-sale securities: Unrealized Gains 0 1,040
Available-for-sale securities: Unrealized Losses 0 0
Available-for-sale securities, Fair Value 125 150,748
Corporate notes and obligations    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale securities: Cost Basis   17,892
Available-for-sale securities: Unrealized Gains   52
Available-for-sale securities: Unrealized Losses   (2)
Available-for-sale securities, Fair Value   17,942
Equity securities    
Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Available-for-sale securities: Cost Basis 15,269 15,269
Available-for-sale securities: Unrealized Gains 5,213 1,209
Available-for-sale securities: Unrealized Losses 0 0
Available-for-sale securities, Fair Value 20,482 16,478
Maximum    
Available-for-sale Securities, Debt Maturities [Abstract]    
Realized gross gains from sale of available-for-sale securities $ 100 $ 100
[1] Classified as short-term investments because these securities are highly liquid and can be sold at any time.