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Assumptions Used in Estimating Fair Value of Award Grants (Detail) (USD $)
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12 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2012
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| Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] | |||
| Interest rates range minimum | 1.30% | 0.60% | 0.70% |
| Interest rates range maximum | 1.80% | 1.10% | 1.70% |
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Lower Limit
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| Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] | |||
| Dividends per share (quarterly amounts) | $ 0.23 | $ 0.20 | $ 0.16 |
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Upper Limit
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| Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] | |||
| Dividends per share (quarterly amounts) | $ 0.28 | $ 0.23 | $ 0.20 |