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Provision for Income Taxes (Schedule of Effective Income Tax Rates) (Details)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Income tax rate reconciliation    
U.S. federal statutory income tax rate 21.00% 28.10%
Increase (reduction) in rate resulting from:    
State franchise tax, net of federal income tax benefit 0.20% (0.10%)
ESOP cost versus Fair Market Value 1.30% 1.10%
Dividend on allocated ESOP shares (3.00%) (2.90%)
Qualified production activities (2.10%)
Stock-based compensation 0.20% 0.10%
Foreign Derived Intangible Income Deduction (0.30%)
Other (0.70%) 0.20%
Effective tax rate 18.70% 24.40%