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Employee Benefit Plans, Allocation of Plan Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Allocation of Plan Assets [Abstract]      
Total plan assets $ 5,139 $ 4,851 $ 5,058
Weighted-average plan asset allocation 100.00% 100.00%  
Amount expected to be amortized from accumulated other comprehensive income in next fiscal year $ 158    
Money Market Funds [Member]      
Allocation of Plan Assets [Abstract]      
Total plan assets $ 0 $ 0  
Weighted-average plan asset allocation 0.00% 0.00%  
Mutual Funds [Member]      
Allocation of Plan Assets [Abstract]      
Total plan assets $ 5,139 $ 4,851  
Weighted-average plan asset allocation 100.00% 100.00%  
Mutual Funds [Member] | Maximum [Member]      
Allocation of Plan Assets [Abstract]      
Allowable variation 5.00%    
Large Cap Value Funds [Member]      
Allocation of Plan Assets [Abstract]      
Target allocation for investment in mutual funds 40.00%    
Short-term and Intermediate-term Fixed Income Bond Funds [Member]      
Allocation of Plan Assets [Abstract]      
Target allocation for investment in mutual funds 60.00%