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Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Sep. 30, 2017
Defined Contribution Plan [Abstract]
Employee Benefit Plan	Employee Benefit Plan We offer a savings plan to eligible U.S. employees. The plan is intended to qualify under Section 401(k) of the Internal Revenue Code. Participating employees may defer a portion of their pre-tax compensation, as defined, but not more than statutory limits. We contribute 50% of the amount contributed by the employee, up to a maximum of 3% of the employee’s earnings. Our matching contributions vest at a rate of 25% per year of service, with full vesting after 4 years of service. We made matching contributions of $5.6 million, $5.4 million, and $5.3 million in 2017, 2016 and 2015, respectively.