XML 94 R79.htm IDEA: XBRL DOCUMENT v3.20.2
Defined Contribution Employee Benefit Plan - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Retirement Benefits [Abstract]      
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 1.0 $ 1.0 $ 1.0