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Marketable Securities (Fair Value and Gross Unrealized Losses for AFS) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Sep. 30, 2014
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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 | $ 47,054 | $ 30,453
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (62) | (47)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 499 | 748
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1) | (2)
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 | 33,664 | 23,475
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (52) | (26)
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
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 | 5,987 | 3,998
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) | (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 | 4,244 | 2,980
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (6) | (20)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 499 | 748
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1) | $ (2)
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 | 3,159 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (3) |
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 |

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