Annual report pursuant to Section 13 and 15(d)

Employee Benefits Plans - Narrative (Details)

v3.8.0.1
Employee Benefits Plans - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Retirement Benefits [Abstract]    
Benefit plan period 180 months  
Weighted-average discount rate 4.08% 4.30%
Estimated future benefit payments, year 2018 $ 348  
Estimated future benefit payments, year 2019 357  
Estimated future benefit payments, year 2020 160  
Estimated future benefit payments, year 2021 192  
Estimated future benefit payments, year 2022 192  
Estimated future benefit payments, thereafter $ 1,249