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Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Sep. 30, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | $ 47,031 | [1] | $ 44,471 | [2]
Available-for-sale securities, unrealized gains |  | 17 |  | 17 |
Available-for-sale securities, unrealized losses |  | (50) |  | (49) |
Available-for-sale marketable securities, fair value |  | 46,998 | [1] | 44,439 | [2]
Purchased and accrued interest |  | 262 |  | 213 |
Current Assets |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 37,558 | [1] | 32,918 | [2]
Available-for-sale securities, unrealized gains |  | 4 |  | 3 |
Available-for-sale securities, unrealized losses |  | (35) |  | (23) |
Available-for-sale marketable securities, fair value |  | 37,527 | [1] | 32,898 | [2]
Current Assets | Corporate Bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 28,065 | [1] | 24,668 | [2]
Available-for-sale securities, unrealized gains |  | 0 |  | 1 |
Available-for-sale securities, unrealized losses |  | (31) |  | (22) |
Available-for-sale marketable securities, fair value |  | 28,034 | [1] | 24,647 | [2]
Current Assets | Commercial Paper |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 3,991 | [1] | 3,998 | [2]
Available-for-sale securities, unrealized gains |  | 0 |  | 0 |
Available-for-sale securities, unrealized losses |  | (4) |  | (1) |
Available-for-sale marketable securities, fair value |  | 3,987 | [1] | 3,997 | [2]
Current Assets | Certificates of Deposit |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 5,502 | [1] | 4,252 | [2]
Available-for-sale securities, unrealized gains |  | 4 |  | 2 |
Available-for-sale securities, unrealized losses |  | 0 |  | 0 |
Available-for-sale marketable securities, fair value |  | 5,506 | [1] | 4,254 | [2]
Non-current Assets |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 9,473 | [1] | 11,553 | [2]
Available-for-sale securities, unrealized gains |  | 13 |  | 14 |
Available-for-sale securities, unrealized losses |  | (15) |  | (26) |
Available-for-sale marketable securities, fair value |  | 9,471 | [1] | 11,541 | [2]
Non-current Assets | Corporate Bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 3,723 | [1] | 2,051 | [2]
Available-for-sale securities, unrealized gains |  | 0 |  | 0 |
Available-for-sale securities, unrealized losses |  | (14) |  | (4) |
Available-for-sale marketable securities, fair value |  | 3,709 | [1] | 2,047 | [2]
Non-current Assets | Certificates of Deposit |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 4,504 | [1] | 9,502 | [2]
Available-for-sale securities, unrealized gains |  | 13 |  | 14 |
Available-for-sale securities, unrealized losses |  | 0 |  | (22) |
Available-for-sale marketable securities, fair value |  | 4,517 | [1] | $ 9,494 | [2]
Non-current Assets | Government municipal bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis | [1] | 1,246 |  |  |
Available-for-sale securities, unrealized gains |  | 0 |  |  |
Available-for-sale securities, unrealized losses |  | (1) |  |  |
Available-for-sale marketable securities, fair value | [1] | $ 1,245 |  |  |
[1] | Included in amortized cost and fair value is purchased and accrued interest of $262
[2] | Included in amortized cost and fair value is purchased and accrued interest of $213.

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