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Employee Benefit Plans - Fair values of plan assets by asset category (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category $ 75,791 $ 64,593 $ 58,648
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 1,812 215  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 68,247 58,729  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 5,732 5,649 $ 6,960
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 1,812 215  
Cash and cash equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 1,812 215  
Cash and cash equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Cash and cash equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Common-collective funds - Global large cap equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 20,716 18,011  
Common-collective funds - Global large cap equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Common-collective funds - Global large cap equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 16,678 13,995  
Common-collective funds - Global large cap equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 4,038 4,016  
Common-collective funds - Fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 49,902 43,288  
Common-collective funds - Fixed income securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Common-collective funds - Fixed income securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 49,902 43,288  
Common-collective funds - Fixed income securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Common-collective funds - Global asset allocations/risk parity      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 1,667 1,446  
Common-collective funds - Global asset allocations/risk parity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Common-collective funds - Global asset allocations/risk parity | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 1,667 1,446  
Common-collective funds - Global asset allocations/risk parity | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Other - Global asset allocations/risk parity      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 1,669 1,447  
Other - Global asset allocations/risk parity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Other - Global asset allocations/risk parity | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Other - Global asset allocations/risk parity | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 1,669 1,447  
Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 25 186  
Other | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category 0 0  
Other | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of plan assets by asset category $ 25 $ 186