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Marketable Securities (Details) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2015 USD ($) Security | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of securities below amortized cost basis | 44 |  |
Number of securities | 81 |  |
Proceeds from maturities of marketable securities | $ | $ 38,028 | $ 47,420 | $ 63,089
Current Assets |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, next twelve months, maximum year mature | 1 year |  |
Non-current Assets |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, year two through five, maximum year mature | 3 years |  |

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