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Defined Benefit Pension Plan - Fair Value Estimates (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Defined benefit pension plan      
Fair values $ 25,779 $ 25,132 $ 26,943
Total      
Defined benefit pension plan      
Fair values 25,779 25,132  
Level 1      
Defined benefit pension plan      
Fair values 94 296  
Level 2      
Defined benefit pension plan      
Fair values 25,685 24,836  
Level 3      
Defined benefit pension plan      
Fair values 0 0  
Equity securities | Total      
Defined benefit pension plan      
Fair values 5,077 11,489  
Equity securities | Level 1      
Defined benefit pension plan      
Fair values 0 0  
Equity securities | Level 2      
Defined benefit pension plan      
Fair values 5,077 11,489  
Equity securities | Level 3      
Defined benefit pension plan      
Fair values 0 0  
Fixed-income securities | Total      
Defined benefit pension plan      
Fair values   13,347  
Fixed-income securities | Level 1      
Defined benefit pension plan      
Fair values   0  
Fixed-income securities | Level 2      
Defined benefit pension plan      
Fair values   13,347  
Fixed-income securities | Level 3      
Defined benefit pension plan      
Fair values   0  
Cash equivalents | Total      
Defined benefit pension plan      
Fair values   296  
Cash equivalents | Level 1      
Defined benefit pension plan      
Fair values   296  
Cash equivalents | Level 2      
Defined benefit pension plan      
Fair values   0  
Cash equivalents | Level 3      
Defined benefit pension plan      
Fair values   $ 0  
Corporate bonds | Total      
Defined benefit pension plan      
Fair values 14,546    
Corporate bonds | Level 1      
Defined benefit pension plan      
Fair values 0    
Corporate bonds | Level 2      
Defined benefit pension plan      
Fair values 14,546    
Corporate bonds | Level 3      
Defined benefit pension plan      
Fair values 0    
Diversified fund | Total      
Defined benefit pension plan      
Fair values 6,062    
Diversified fund | Level 1      
Defined benefit pension plan      
Fair values 0    
Diversified fund | Level 2      
Defined benefit pension plan      
Fair values 6,062    
Diversified fund | Level 3      
Defined benefit pension plan      
Fair values 0    
Cash | Total      
Defined benefit pension plan      
Fair values 94    
Cash | Level 1      
Defined benefit pension plan      
Fair values 94    
Cash | Level 2      
Defined benefit pension plan      
Fair values 0    
Cash | Level 3      
Defined benefit pension plan      
Fair values $ 0