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Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | $ 32,492 | [1] | $ 36,788 | [2]
Available-for-sale securities, unrealized gains | 1 |  | 4 |
Available-for-sale securities, unrealized losses | (42) |  | (24) |
Available-for-sale marketable securities, fair value | 32,451 | [1] | 36,768 | [2]
Purchased and accrued interest | 201 |  | 211 |
Current Assets |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 28,230 | [1] | 32,031 | [2]
Available-for-sale securities, unrealized gains | 1 |  | 4 |
Available-for-sale securities, unrealized losses | (27) |  | (20) |
Available-for-sale marketable securities, fair value | 28,204 | [1] | 32,015 | [2]
Current Assets | Corporate Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 24,217 | [1] | 28,275 | [2]
Available-for-sale securities, unrealized gains | 0 |  | 0 |
Available-for-sale securities, unrealized losses | (26) |  | (20) |
Available-for-sale marketable securities, fair value | 24,191 | [1] | 28,255 | [2]
Current Assets | Certificates of Deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 4,013 | [1] | 3,756 | [2]
Available-for-sale securities, unrealized gains | 1 |  | 4 |
Available-for-sale securities, unrealized losses | (1) |  | 0 |
Available-for-sale marketable securities, fair value | 4,013 | [1] | 3,760 | [2]
Non-current Assets | Certificates of Deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 4,262 | [1] | 4,757 | [2]
Available-for-sale securities, unrealized gains | 0 |  | 0 |
Available-for-sale securities, unrealized losses | (15) |  | (4) |
Available-for-sale marketable securities, fair value | $ 4,247 | [1] | $ 4,753 | [2]
[1] | Included in amortized cost and fair value is purchased and accrued interest of $201
[2] | Included in amortized cost and fair value is purchased and accrued interest of $211.

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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