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Employee Benefit Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]      
Contributions by the Company to the plan $ 10.5 $ 10.5 $ 9.5
Employer contribution, vesting period 4 years