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Provision for Income Taxes (Schedule of Effective Income Tax Rates) (Details)
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Income tax rate reconciliation    
U.S. federal statutory income tax rate 34.00% 34.00%
Increase (reduction) in rate resulting from:    
State franchise tax, net of federal income tax benefit 0.10%
ESOP cost versus Fair Market Value 3.60% 1.50%
Dividend on allocated ESOP shares (7.20%) (3.20%)
Qualified production activities (2.80%) (2.70%)
Stock-based compensation 1.80% (0.20%)
Other 1.70% (0.60%)
Effective tax rate 31.20% 28.80%