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Employee Benefit Plans, Schedule of Allocation of Plan Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets $ 5,058 $ 4,391 $ 4,481
Weighted-average plan asset allocation 100.00% 100.00%  
Amount expected to be amortized from accumulated other comprehensive income in next fiscal year $ 168    
Money Market Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets $ 0 $ 16  
Weighted-average plan asset allocation 0.00% 0.40%  
Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets $ 5,058 $ 4,375  
Weighted-average plan asset allocation 100.00% 99.60%  
Mutual Funds [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Allowable variation 5.00%    
Large Cap Value Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation for investment in mutual funds 20.00%    
Short-term and Intermediate-term Fixed Income Bond Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation for investment in mutual funds 80.00%