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Share-Based Compensation - Summary of information about stock options 1998 plan (Details) - 1998 Plan - Options	12 Months Ended
	Sep. 30, 2016 $ / shares shares
Information about stock options, by exercise price range
Options outstanding at the end of the period (in shares) | shares	30,000
Options Outstanding - Weighted-Average Remaining Contractual Life	1 year 4 months 22 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share)	$ 6.27
Options exercisable at the end of the period (in shares) | shares	30,000
Options Exercisable - Weighted-Average Exercise Price (in dollars per share)	$ 6.27
Range of Exercise Price - $0.00 - $5.00
Information about stock options, by exercise price range
Exercise price, low end of range (in dollars per share)	0.00
Exercise price, high end of range (in dollars per share)	5.00
Range of Exercise Price - $5.01 - $10.00
Information about stock options, by exercise price range
Exercise price, low end of range (in dollars per share)	5.01
Exercise price, high end of range (in dollars per share)	$ 10.00
Options outstanding at the end of the period (in shares) | shares	30,000
Options Outstanding - Weighted-Average Remaining Contractual Life	1 year 4 months 22 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share)	$ 6.27
Options exercisable at the end of the period (in shares) | shares	30,000
Options Exercisable - Weighted-Average Exercise Price (in dollars per share)	$ 6.27
Range of Exercise Price - $10.01 - $15.00
Information about stock options, by exercise price range
Exercise price, low end of range (in dollars per share)	10.01
Exercise price, high end of range (in dollars per share)	$ 15.00

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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 (c)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ 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 (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ 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 (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ 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 (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (e)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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