Assumptions Used in Estimating the Fair Value of Stock Award Grants (Detail) - $ / shares |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2016 |
|
| Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] | |||
| Interest rates minimum | 1.70% | 1.20% | 1.10% |
| Interest rates maximum | 2.90% | 2.20% | 1.80% |
| Lower Limit | |||
| Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] | |||
| Dividends per share (quarterly amounts) | $ 0.39 | $ 0.36 | $ 0.31 |
| Upper Limit | |||
| Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] | |||
| Dividends per share (quarterly amounts) | $ 0.42 | $ 0.39 | $ 0.36 |