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

Sep. 30, 2018

Sep. 30, 2017

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

Available-for-sale securities, amortized cost basis

$ 4,756

^[1]

$ 36,788

^[2]

Available-for-sale securities, unrealized gains

0

4

Available-for-sale securities, unrealized losses

(20)

(24)

Available-for-sale marketable securities, fair value

4,736

^[1]

36,768

^[2]

Purchased and accrued interest

6

211

Current Assets

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

Available-for-sale securities, amortized cost basis

32,031

Available-for-sale securities, unrealized gains

4

Available-for-sale securities, unrealized losses

(20)

Available-for-sale marketable securities, fair value

32,015

Current Assets | Corporate bonds

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

Available-for-sale securities, amortized cost basis

28,275

Available-for-sale securities, unrealized gains

0

Available-for-sale securities, unrealized losses

(20)

Available-for-sale marketable securities, fair value

28,255

Current Assets | Certificates of deposit

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

Available-for-sale securities, amortized cost basis

4,756

3,756

Available-for-sale securities, unrealized gains

0

4

Available-for-sale securities, unrealized losses

(20)

0

Available-for-sale marketable securities, fair value

$ 4,736

3,760

Non-current Assets | Certificates of deposit

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

Available-for-sale securities, amortized cost basis

4,757

Available-for-sale securities, unrealized gains

0

Available-for-sale securities, unrealized losses

(4)

Available-for-sale marketable securities, fair value

$ 4,753

[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 $211

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=82897076&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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=82897076&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=82897076&loc=d3e27161-111563

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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 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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