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Investments and Fair Value Measurements Investments and Fair Value Measurements (Investment Maturities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Fair Value Disclosures [Abstract]    
Document Period End Date Sep. 28, 2018  
Amortized Cost    
Due within 1 year $ 191,241 $ 251,649
Due in 1 to 2 years 122,131 213,555
Due in 2 to 3 years 67,423 96,773
Total 380,795 561,977
Fair Value    
Due within 1 year 190,541 251,530
Due in 1 to 2 years 120,545 213,154
Due in 2 to 3 years 66,637 96,682
Total $ 377,723 $ 561,366