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Summary Of Significant Accounting Policies (Marketable Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 15,494 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 31,287 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 46,781 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 43 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 102 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 145 |
Amortized cost | 50,458 | $ 49,738
Gross unrealized gains | 2 | 0
Gross unrealized losses | (145) | (122)
Fair value | 50,315 | 49,616
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis | 18,274 | 18,585
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value | 18,244 | 18,549
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis | 32,184 | 31,153
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value | 32,071 | 31,067
Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 240 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 240 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Amortized cost | 240 | 681
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 240 | 681
Commercial Paper[Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost |  | 11,945
Gross unrealized gains |  | 0
Gross unrealized losses |  | (20)
Fair value |  | 11,925
Corporate notes/bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 15,254 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 28,885 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 44,139 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 43 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 97 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 140 |
Amortized cost | 47,811 | 34,701
Gross unrealized gains | 2 | 0
Gross unrealized losses | (140) | (100)
Fair value | 47,673 | 34,601
US Government Agencies Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 2,402 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2,402 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 5 |
Amortized cost | 2,407 | 2,411
Gross unrealized gains | 0 | 0
Gross unrealized losses | (5) | (2)
Fair value | $ 2,402 | $ 2,409

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