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Assumptions Used in Estimating the Fair Value of Stock Award Grants (Detail) - $ / shares | 12 Months Ended
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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

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- Definition Share Based Compensation Arrangement By Share Based Payment Award, Fair Value Assumptions, Expected Dividends Per Share + References No definition available. + Details
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- Definition Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] + References No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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