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Defined Benefit Pension Plan - Fair Value Estimates (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Defined benefit pension plan      
Fair values $ 28,208 $ 26,771 $ 25,779
Total      
Defined benefit pension plan      
Fair values 28,208 26,771  
Level 1      
Defined benefit pension plan      
Fair values 191 94  
Level 2      
Defined benefit pension plan      
Fair values 28,017 26,677  
Level 3      
Defined benefit pension plan      
Fair values 0 0  
Equity securities | Total      
Defined benefit pension plan      
Fair values 5,860 5,526  
Equity securities | Level 1      
Defined benefit pension plan      
Fair values 0 0  
Equity securities | Level 2      
Defined benefit pension plan      
Fair values 5,860 5,526  
Equity securities | Level 3      
Defined benefit pension plan      
Fair values 0 0  
Corporate bonds | Total      
Defined benefit pension plan      
Fair values 14,878 14,194  
Corporate bonds | Level 1      
Defined benefit pension plan      
Fair values 0 0  
Corporate bonds | Level 2      
Defined benefit pension plan      
Fair values 14,878 14,194  
Corporate bonds | Level 3      
Defined benefit pension plan      
Fair values 0 0  
Diversified fund | Total      
Defined benefit pension plan      
Fair values 7,279 6,957  
Diversified fund | Level 1      
Defined benefit pension plan      
Fair values 0 0  
Diversified fund | Level 2      
Defined benefit pension plan      
Fair values 7,279 6,957  
Diversified fund | Level 3      
Defined benefit pension plan      
Fair values 0 0  
Cash | Total      
Defined benefit pension plan      
Fair values 191 94  
Cash | Level 1      
Defined benefit pension plan      
Fair values 191 94  
Cash | Level 2      
Defined benefit pension plan      
Fair values 0 0  
Cash | Level 3      
Defined benefit pension plan      
Fair values $ 0 $ 0