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Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Sep. 30, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | $ 19,249 | [1] | $ 61,928 | [2]
Available-for-sale securities, unrealized gains |  | 6 |  | 49 |
Available-for-sale securities, unrealized losses |  | (14) |  | (54) |
Available-for-sale marketable securities, fair value |  | 19,241 | [1] | 61,923 | [2]
Purchased and accrued interest |  | 175 |  | 271 |
Current Assets |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 17,242 | [1] | 58,423 | [2]
Available-for-sale securities, unrealized gains |  | 2 |  | 13 |
Available-for-sale securities, unrealized losses |  | (14) |  | (54) |
Available-for-sale marketable securities, fair value |  | 17,230 | [1] | 58,382 | [2]
Current Assets | Corporate Bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 10,226 | [1] | 28,801 | [2]
Available-for-sale securities, unrealized gains |  | 0 |  | 0 |
Available-for-sale securities, unrealized losses |  | (13) |  | (34) |
Available-for-sale marketable securities, fair value |  | 10,213 | [1] | 28,767 | [2]
Current Assets | Commercial Paper |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 2,000 | [1] | 23,963 | [2]
Available-for-sale securities, unrealized gains |  | 0 |  | 0 |
Available-for-sale securities, unrealized losses |  | (1) |  | (20) |
Available-for-sale marketable securities, fair value |  | 1,999 | [1] | 23,943 | [2]
Current Assets | Certificates of Deposit |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 5,016 | [1] | 3,755 | [2]
Available-for-sale securities, unrealized gains |  | 2 |  | 13 |
Available-for-sale securities, unrealized losses |  | 0 |  | 0 |
Available-for-sale marketable securities, fair value |  | 5,018 | [1] | 3,768 | [2]
Current Assets | Government municipal bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis | [2] |  |  | 1,904 |
Available-for-sale securities, unrealized gains |  |  |  | 0 |
Available-for-sale securities, unrealized losses |  |  |  | 0 |
Available-for-sale marketable securities, fair value | [2] |  |  | 1,904 |
Non-current Assets | Certificates of Deposit |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 2,007 | [1] | 3,505 | [2]
Available-for-sale securities, unrealized gains |  | 4 |  | 36 |
Available-for-sale securities, unrealized losses |  | 0 |  | 0 |
Available-for-sale marketable securities, fair value |  | $ 2,011 | [1] | $ 3,541 | [2]
[1] | Included in amortized cost and fair value is purchased and accrued interest of $175
[2] | Included in amortized cost and fair value is purchased and accrued interest of $271.

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