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Defined Contribution Plan	12 Months Ended
Defined Contribution Plan	Sep. 30, 2016
Compensation And Retirement Disclosure [Abstract]
Defined Contribution Plan	9. Defined Contribution Plan The Company has a 401(k) retirement and savings plan for the benefit of qualifying U.S. employees. The Company matches 50% of employee contributions on the first 6% of eligible compensation. Company contributions totaling $0.3 million, $0.3 million and $0.2 million have been expensed in the years ended September 30, 2016, 2015 and 2014, respectively.