Annual report pursuant to Section 13 and 15(d)

Employee Benefits Plans - Narrative (Details)

v3.10.0.1
Employee Benefits Plans - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Retirement Benefits [Abstract]      
Benefit plan period 180 months    
Weighted-average discount rate 4.08% 4.08%  
Estimated future benefit payments $ 357    
Matching contribution (as a percent) (up to) 4.00%    
Contribution to plan $ 342 $ 445 $ 401
Contribution to profit sharing plan $ 0 $ 378 $ 291