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Note 8. Stock Compensation Plans - Relative Total Shareholder Return Performance Unit Textuals (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Relative Total Shareholder Return, Earned Percentage, Target 100.00%    
Allocated Share-based Compensation Expense $ 5.6 $ 5.6 $ 5.5
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 2.2 $ 2.2 $ 2.2
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Relative Total Shareholder Return, Earned Percentage 0.00%    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Relative Total Shareholder Return, Earned Percentage 200.00%    
Relative Total Shareholder Return      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized Compensation Cost $ 0.5    
Average Vesting Period for Unrecognized Compensation Cost 1 year 7 months    
Weighted Average Grant Date Fair Value of Shares Granted $ 15.10 $ 11.48  
Shares Vested 0 0 0
Relative Total Shareholder Return | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Arrangement By Share Based Payment Award Contractual Life 2 years 4 months    
Relative Total Shareholder Return | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Arrangement By Share Based Payment Award Contractual Life 3 years