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Incentive Plans Incentive Plans: Equity Incentive Plan Policy: Valuation Assumptions (Details) - Equity Incentive Plans - Employee Stock Option [Member]
3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility   0.00%   0.00%
Weighted-average volatility   0.00% 41.70% 0.00%
Expected dividend yield   0.00% 2.70% 0.00%
Expected term 0 years 0 years 7 years 4 months 24 days  
Risk-free interest rate   0.00% 1.50% 0.00%
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility     41.40%  
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility     41.70%