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Marketable Securities (Details) $ in Thousands | 9 Months Ended
--- | ---
Jun. 30, 2017 USD ($) Security | Jun. 30, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |
Number of securities below amortized cost basis | 7 |
Number of securities | 34 |
Proceeds from maturities and sales of marketable securities | $ | $ 76,149 | $ 46,664
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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