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Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | $ 36,788 | [1] | $ 61,928 | [2]
Available-for-sale securities, unrealized gains | 4 |  | 49 |
Available-for-sale securities, unrealized losses | (24) |  | (54) |
Available-for-sale marketable securities, fair value | 36,768 | [1] | 61,923 | [2]
Purchased and accrued interest | 211 |  | 271 |
Current Assets |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 32,031 |  | 58,423 |
Available-for-sale securities, unrealized gains | 4 |  | 13 |
Available-for-sale securities, unrealized losses | (20) |  | (54) |
Available-for-sale marketable securities, fair value | 32,015 |  | 58,382 |
Current Assets | Corporate bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 28,275 |  | 28,801 |
Available-for-sale securities, unrealized gains | 0 |  | 0 |
Available-for-sale securities, unrealized losses | (20) |  | (34) |
Available-for-sale marketable securities, fair value | 28,255 |  | 28,767 |
Current Assets | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis |  |  | 23,963 |
Available-for-sale securities, unrealized gains |  |  | 0 |
Available-for-sale securities, unrealized losses |  |  | (20) |
Available-for-sale marketable securities, fair value |  |  | 23,943 |
Current Assets | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 3,756 |  | 3,755 |
Available-for-sale securities, unrealized gains | 4 |  | 13 |
Available-for-sale securities, unrealized losses | 0 |  | 0 |
Available-for-sale marketable securities, fair value | 3,760 |  | 3,768 |
Current Assets | Government municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis |  |  | 1,904 |
Available-for-sale securities, unrealized gains |  |  | 0 |
Available-for-sale securities, unrealized losses |  |  | 0 |
Available-for-sale marketable securities, fair value |  |  | 1,904 |
Non-current Assets | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 4,757 |  | 3,505 |
Available-for-sale securities, unrealized gains | 0 |  | 36 |
Available-for-sale securities, unrealized losses | (4) |  | 0 |
Available-for-sale marketable securities, fair value | $ 4,753 |  | $ 3,541 |
[1] | Included in amortized cost and fair value is purchased and accrued interest of $211.
[2] | Included in amortized cost and fair value is purchased and accrued interest of $271

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