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Investments and Fair Value Measurements Investments and Fair Value Measurements (Investment Maturities) (Details) - USD ($)
$ in Thousands
Sep. 29, 2017
Sep. 30, 2016
Amortized Cost    
Due within 1 year $ 251,649 $ 135,886
Due in 1 to 2 years 213,555 225,679
Due in 2 to 3 years 96,773 164,339
Total 561,977 525,904
Fair Value    
Due within 1 year 251,530 135,884
Due in 1 to 2 years 213,154 225,953
Due in 2 to 3 years 96,682 164,583
Total $ 561,366 $ 526,420