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Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Sep. 30, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | $ 0 |  | $ 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (6) |  | (20) |
Debt Securities, Available-for-sale | 2,497 | [1] | 4,736 | [2]
Debt Securities, Available-for-sale, Amortized Cost | 2,503 | [1] | 4,756 | [2]
Available-for-sale Securities, Purchased and accrued interest | 3 |  | 6 |
Current Assets | Certificates of Deposit |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (6) |  | (20) |
Debt Securities, Available-for-sale | 2,497 | [1] | 4,736 | [2]
Debt Securities, Available-for-sale, Amortized Cost | $ 2,503 | [1] | $ 4,756 | [2]
[1] | Included in amortized cost and fair value is purchased and accrued interest of $3
[2] | Included in amortized cost and fair value is purchased and accrued interest of $6.

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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