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Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 50,094 | $ 49,738
Available-for-sale Securities, Gross Unrealized Gain | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss | (260) | (122)
Available-for-sale Securities | 49,834 | 49,616
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis | 22,650 | 18,585
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value | 22,618 | 18,549
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis | 27,444 | 31,153
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value | 27,216 | 31,067
Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 881 | 681
Available-for-sale Securities, Gross Unrealized Gain | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss | (1) | 0
Available-for-sale Securities | 880 | 681
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 11,972 | 11,945
Available-for-sale Securities, Gross Unrealized Gain | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss | (8) | (20)
Available-for-sale Securities | 11,964 | 11,925
Corporate Bond Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 34,839 | 34,701
Available-for-sale Securities, Gross Unrealized Gain | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss | (240) | (100)
Available-for-sale Securities | 34,599 | 34,601
US Government Agencies Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 2,402 | 2,411
Available-for-sale Securities, Gross Unrealized Gain | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss | (11) | (2)
Available-for-sale Securities | $ 2,391 | $ 2,409

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