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Investments (Amortized Cost and Fair Value of Held to Maturity Investments) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Schedule of Held-to-maturity Securities [Line Items]
Trading Securities, Unrealized Holding Gain	$ 0
Amortized Cost		$ 7,759,000
Gross Unrealized Gains		0
Gross Unrealized Losses		(4,000)
Estimated Fair Market Value		7,755,000
Corporate bonds, due in less than 1 year
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		7,759,000
Gross Unrealized Gains		0
Gross Unrealized Losses		(4,000)
Estimated Fair Market Value		$ 7,755,000

X

- Definition

Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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- Definition

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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- Definition

Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

+ References

No definition available.

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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- Definition

Amount of unrealized holding gain before loss recognized in the income statement for investments in trading securities.

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