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Per Common Share Amounts - Additional Information (Details)	3 Months Ended
	Dec. 31, 2017 shares	Dec. 31, 2016 shares	Sep. 30, 2017 shares
Class of Stock [Line Items]
Common stock shares authorized (in shares)	15,000,000
Weighted average common stock shares outstanding diluted (in shares)	16,084,000	16,028,000
Class A membership units
Class of Stock [Line Items]
Conversion ratio	1
Weighted average common stock shares outstanding diluted (in shares)	30,164,066
Class B-1 common shares
Class of Stock [Line Items]
Common stock shares authorized (in shares)	1,000,000		1,000,000
Conversion ratio	1

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
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