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Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 30, 2017 | Sep. 30, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 50,890 | $ 50,458
Gross unrealized gains | 0 | 2
Gross unrealized losses | (323) | (145)
Fair value | 50,567 | 50,315
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 22,893 | 15,494
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (184) | (43)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 27,674 | 31,287
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (139) | (102)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 50,567 | 46,781
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (323) | (145)
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis | 20,025 | 18,274
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value | 19,962 | 18,244
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis | 30,865 | 32,184
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value | 30,605 | 32,071
Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 221 | 240
Gross unrealized gains | 0 | 0
Gross unrealized losses | (1) | 0
Fair value | 220 | 240
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 220 | 240
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 220 | 240
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1) | 0
Corporate notes/bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 48,268 | 47,811
Gross unrealized gains | 0 | 2
Gross unrealized losses | (311) | (140)
Fair value | 47,957 | 47,673
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 22,673 | 15,254
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (183) | (43)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 25,284 | 28,885
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (128) | (97)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 47,957 | 44,139
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (311) | (140)
U.S. government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 2,401 | 2,407
Gross unrealized gains | 0 | 0
Gross unrealized losses | (11) | (5)
Fair value | 2,390 | 2,402
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 2,390 | 2,402
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (11) | (5)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2,390 | 2,402
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (11) | $ (5)

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