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Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Sep. 30, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | $ 38,358 | [1] | $ 61,928 | [2]
Available-for-sale securities, unrealized gains |  | 16 |  | 49 |
Available-for-sale securities, unrealized losses |  | (31) |  | (54) |
Available-for-sale marketable securities, fair value |  | 38,343 | [1] | 61,923 | [2]
Purchased and accrued interest |  | 189 |  | 271 |
Current Assets |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 36,105 | [1] | 58,423 | [2]
Available-for-sale securities, unrealized gains |  | 7 |  | 13 |
Available-for-sale securities, unrealized losses |  | (31) |  | (54) |
Available-for-sale marketable securities, fair value |  | 36,081 | [1] | 58,382 | [2]
Current Assets | Corporate Bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 25,360 | [1] | 28,801 | [2]
Available-for-sale securities, unrealized gains |  | 0 |  | 0 |
Available-for-sale securities, unrealized losses |  | (29) |  | (34) |
Available-for-sale marketable securities, fair value |  | 25,331 | [1] | 28,767 | [2]
Current Assets | Commercial Paper |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 5,988 | [1] | 23,963 | [2]
Available-for-sale securities, unrealized gains |  | 0 |  | 0 |
Available-for-sale securities, unrealized losses |  | (2) |  | (20) |
Available-for-sale marketable securities, fair value |  | 5,986 | [1] | 23,943 | [2]
Current Assets | Certificates of Deposit |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 4,757 | [1] | 3,755 | [2]
Available-for-sale securities, unrealized gains |  | 7 |  | 13 |
Available-for-sale securities, unrealized losses |  | 0 |  | 0 |
Available-for-sale marketable securities, fair value |  | 4,764 | [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 |  | 2,253 | [1] | 3,505 | [2]
Available-for-sale securities, unrealized gains |  | 9 |  | 36 |
Available-for-sale securities, unrealized losses |  | 0 |  | 0 |
Available-for-sale marketable securities, fair value |  | $ 2,262 | [1] | $ 3,541 | [2]
[1] | Included in amortized cost and fair value is purchased and accrued interest of $189
[2] | Included in amortized cost and fair value is purchased and accrued interest of $271.

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