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Stock Based Compensation Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expense for stock-based compensation $ 12,589 $ 11,758 $ 11,129
Restricted Stock Plan Expense 10,828 10,256 9,861
Tax benefit from stock-based compensation expense 6,191 3,274 $ 2,638
Stock Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 15.78
Restricted Shares and Units, Vested in Period, Fair Value $ 34,645 $ 17,951 $ 15,085
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, number of shares 0 0 32,000
Compensation not yet recognized, stock options $ 0    
Total intrinsic value of options exercised $ 2,289 $ 2,165 $ 747
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Authorized 3,000,000    
Granted, number of shares 0 0 17,000
Compensation expense yet to be recognized $ 0    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, number of shares 80,000 125,000 130,000
Compensation expense yet to be recognized $ 13,444    
Compensation expense yet to be recognized, period for recognition 1 year 15 days    
2015 EIP [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Authorized 3,000,000    
2015 EIP [Member] | Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite Service Period 3 years    
Stock Option Termination Period After Termination of Employment 90 days    
Stock Option Termination Period After Death 1 year    
Stock Option Termination After Grant Date 10 years    
2005 NSOP [Member] | Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite Service Period 4 years    
Stock Option Termination Period After Death 1 year    
Stock Option Termination After Grant Date 10 years    
Vesting Period 6 months    
Common Stock Reserved for Future Issuance 700    
Common Stock Reserved for Future Issuance for each Director 100    
Minimum [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite Service Period 3 years    
Minimum [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting Period 1 year    
Maximum [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite Service Period 5 years    
Maximum [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting Period 3 years    
Fair value on grant date less PV of dividends [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, number of shares 41,000    
Fair value under Monte Carlo [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, number of shares 39,000    
Percent vesting after one year of service [Member] | 2005 NSOP [Member] | Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Option, Percent Vesting 25.00%    
Percent vesting after two years of service [Member] | 2005 NSOP [Member] | Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Option, Percent Vesting 50.00%    
Percent vesting after three years of service [Member] | 2005 NSOP [Member] | Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Option, Percent Vesting 75.00%