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Marketable Securities (Details) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 USD ($) Security | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of securities below amortized cost basis | 25 |  |
Number of securities | 44 |  |
Proceeds from maturities of marketable securities | $ | $ 87,105 | $ 73,706 | $ 38,028
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 | 2 years |  |

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