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Marketable Securities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) Security | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) Security | Jun. 30, 2014 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Number of securities below amortized cost basis | 25 |  | 25 |
Number of securities | 63 |  | 63 |
Proceeds from maturities of marketable securities | $ | $ 8,700 | $ 21,600 | $ 28,494 | $ 35,364
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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