Equity Securities and Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Equity Securities and Stock-Based Compensation
Treasury stock and related deferred compensation obligation at fair value	$ 2,400		$ 2,400
Amount that the fair values of treasury stock and related deferred compensation obligation exceed the carrying values at cost	1,000		1,000
Stock-based compensation	400	$ 800	901	$ 1,521
Total compensation cost related to unvested awards not yet recognized	$ 1,600		$ 1,600

No definition available.

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- Definition

Represents the fair value of treasury stock and the related deferred compensation obligation in accordance with the terms of Directors' Deferred Compensation Plan.

+ References

No definition available.

+ Details

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- Definition

Represents the amount that the fair values of treasury stock and related deferred compensation obligation exceed the carrying values at cost.

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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