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Share-Based Compensation - Schedule of Fair Value of Each Option Award Estimated on Date of Grant Using Black-Scholes Option Valuation Model (Detail) (USD $)
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9 Months Ended | |
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Mar. 31, 2015
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Mar. 31, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected volatility minimum | 31.60% | 32.70% |
| Expected volatility maximum | 39.30% | 55.40% |
| Weighted-average volatility | 35.90% | 45.90% |
| Expected annual dividend | $ 1.32 | $ 1.20 |
| Risk-free rate minimum | 0.40% | 0.30% |
| Risk-free rate maximum | 1.40% | 1.80% |
| Minimum [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected term (in years) | 2 years 1 month 13 days | 2 years 7 months 6 days |
| Maximum [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected term (in years) | 4 years 5 months 16 days | 4 years 7 months 28 days |