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Amount of the effect of a change in accounting principle on diluted earnings per share.

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Basis of Presentation of Unaudited Interim Condensed Consolidated Financial Statements and Significant Accounting Policies Adoption of ASU 2016-09 (Details) - USD ($)	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Oct. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision	$ 2,606,000	$ 765,000
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision	$ 500,000
ASU 2016-09 adoption, impact on earnings per share	$ (0.02)
ASU 2016-09 adoption, impact on retained earnings			$ 33,000