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Assumptions Used in Estimating the Fair Value of Stock Award Grants (Detail) - $ / shares
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]      
Interest rates minimum 0.10% 1.80% 1.70%
Interest rates maximum 2.20% 3.10% 2.90%
Lower Limit      
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]      
Dividends per share (quarterly amounts) $ 0.46 $ 0.42 $ 0.39
Upper Limit      
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]      
Dividends per share (quarterly amounts) $ 0.51 $ 0.46 $ 0.42