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Marketable Securities (Details) $ in Thousands | 6 Months Ended
--- | ---
Mar. 31, 2017 USD ($) Security | Mar. 31, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |
Number of securities below amortized cost basis | 14 |
Number of securities | 42 |
Proceeds from maturities and sales of marketable securities | $ | $ 57,039 | $ 27,509
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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