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Marketable Securities (Fair Value and Gross Unrealized Losses for AFS) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Sep. 30, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months | $ 49,330 | $ 47,054
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (121) | (62)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 5,498 | 499
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3) | (1)
Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months | 29,496 | 33,664
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (88) | (52)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 5,000 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1) | 0
Commercial Paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months | 5,985 | 5,987
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (6) | (1)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months | 10,728 | 4,244
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (22) | (6)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 498 | 499
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2) | (1)
Government municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months | 3,121 | 3,159
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (5) | (3)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 | $ 0

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