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Marketable Securities (Schedule of Fair Value and Gross Unrealized Losses) (Details) - Corporate notes/bonds - USD ($)
$ in Thousands
Mar. 28, 2020
Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 44,598 $ 12,419
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (510) (14)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 16,369
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (14)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 44,598 28,788
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (510) $ (28)