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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended 36 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Excess tax benefit from stock-based payment arrangements $ 1,494 $ 1,761 $ (817) $ 0
Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued 6,997 6,208    
Compensation cost $ 400 $ 300    
Stock Option Plans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period for performance awards, years 10 years      
Compensation cost       $ 0
Options issued under stock option plans       0
Excess tax benefit from stock-based payment arrangements $ 600 1,600 400  
Proceeds from Stock Options Exercised $ 400 1,500 1,600  
New Long-Term Management Incentive Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares approved to be issued under plan 700,000     700,000
Shares issued 61,969      
Compensation cost $ 900 1,100 1,100  
New Long-Term Management Incentive Compensation Plan [Member] | 2015-2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost 900      
New Long-Term Management Incentive Compensation Plan [Member] | 2016-2018[Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost 1,000      
New Long-Term Management Incentive Compensation Plan [Member] | 2017-2019 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost $ 1,100      
New Omnibus Stock Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares approved to be issued under plan 700,000     700,000
Compensation cost $ 300 $ 200 $ 400  
Period options are excercisable 10 years      
Options issued under stock option plans 24,317 25,868 48,600  
Weighted average exercise price of options $ 47.45 $ 43.09 $ 31.48 $ 47.45
Dividend yield 1.50% 1.60% 2.00%  
Expected volatility 30.80% 26.00% 29.90%  
Risk-free interest rate 1.20% 1.60% 1.60%  
Expected life 5 years      
Weighted average grant date fair value $ 11.76 $ 9.20 $ 7.33  
Shares available for future grants 537,762     537,762
Proceeds from Stock Options Exercised $ 700 $ 100 $ 100  
Minimum [Member] | 2015-2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants 11,000     11,000
Minimum [Member] | 2016-2018[Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants 9,000     9,000
Minimum [Member] | 2017-2019 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants 11,000     11,000
Target [Member] | 2015-2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants 28,000     28,000
Target [Member] | 2016-2018[Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants 23,000     23,000
Target [Member] | 2017-2019 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants 27,000     27,000
Maximum [Member] | 2015-2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants 55,000     55,000
Maximum [Member] | 2016-2018[Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants 45,000     45,000
Maximum [Member] | 2017-2019 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants 52,000     52,000