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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

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