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Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 55,853 | $ 50,458
Gross unrealized gains | 0 | 2
Gross unrealized losses | (589) | (145)
Fair value | 55,264 | 50,315
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 30,931 | 15,494
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (414) | (43)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 24,333 | 31,287
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (175) | (102)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 55,264 | 46,781
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (589) | (145)
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis | 22,772 | 18,274
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value | 22,636 | 18,244
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis | 33,081 | 32,184
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value | 32,628 | 32,071
Available-for-sale Debt Securities, Amortized Cost Basis | 55,853 | 50,458
Available-for-sale Securities, Debt Securities | 55,264 | 50,315
Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 220 | 240
Gross unrealized gains | 0 | 0
Gross unrealized losses | (1) | 0
Fair value | 219 | 240
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 219 | 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 | 219 | 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 | 53,225 | 47,811
Gross unrealized gains | 0 | 2
Gross unrealized losses | (575) | (140)
Fair value | 52,650 | 47,673
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 30,712 | 15,254
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (413) | (43)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 21,938 | 28,885
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (162) | (97)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 52,650 | 44,139
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (575) | (140)
U.S. government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 2,408 | 2,407
Gross unrealized gains | 0 | 0
Gross unrealized losses | (13) | (5)
Fair value | 2,395 | 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 | 2,395 | 2,402
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (13) | (5)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2,395 | 2,402
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (13) | $ (5)

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