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

Jun. 30, 2018

Sep. 30, 2017

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

$ 7,035

^[1]

$ 36,788

^[2]

Available-for-sale securities, unrealized gains

0

4

Available-for-sale securities, unrealized losses

(29)

(24)

Available-for-sale marketable securities, fair value

7,006

^[1]

36,768

^[2]

Purchased and accrued interest

35

211

Current Assets

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

^[2]

32,031

Available-for-sale securities, unrealized gains

4

Available-for-sale securities, unrealized losses

(20)

Available-for-sale marketable securities, fair value

^[2]

32,015

Current Assets | Corporate Bonds

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

^[2]

28,275

Available-for-sale securities, unrealized gains

0

Available-for-sale securities, unrealized losses

(20)

Available-for-sale marketable securities, fair value

^[2]

28,255

Current Assets | Certificates of Deposit

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

4,773

^[1]

3,756

^[2]

Available-for-sale securities, unrealized gains

0

4

Available-for-sale securities, unrealized losses

(10)

0

Available-for-sale marketable securities, fair value

4,763

^[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

2,262

^[1]

4,757

^[2]

Available-for-sale securities, unrealized gains

0

0

Available-for-sale securities, unrealized losses

(19)

(4)

Available-for-sale marketable securities, fair value

$ 2,243

^[1]

$ 4,753

^[2]

[1]	Included in amortized cost and fair value is purchased and accrued interest of $35
[2]	Included in amortized cost and fair value is purchased and accrued interest of $211.

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- Definition

Available-for-sale Securities, Purchased and accrued interest

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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

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