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Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($)
$ in Thousands

Jun. 30, 2019

Sep. 30, 2018

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale, Amortized Cost

$ 2,255

^[1]

$ 4,756

^[2]

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax

0

0

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax

(1)

(20)

Debt Securities, Available-for-sale

2,254

^[1]

4,736

^[2]

Available-for-sale Securities, Purchased and accrued interest

6

6

Current Assets | Certificates of Deposit

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale, Amortized Cost

2,255

^[1]

4,756

^[2]

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax

0

0

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax

(1)

(20)

Debt Securities, Available-for-sale

$ 2,254

^[1]

$ 4,736

^[2]

[1]	Included in amortized cost and fair value is purchased and accrued interest of $6
[2]	Included in amortized cost and fair value is purchased and accrued interest of $6.

X

- Definition

Available-for-sale Securities, Purchased and accrued interest

+ References

No definition available.

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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=118939692&loc=d3e27161-111563

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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=118939692&loc=d3e27161-111563

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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=118939692&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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- Definition

Amount 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 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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