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Assumptions To Value Stock Options (Detail)
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9 Months Ended |
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Feb. 28, 2014
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Non-Qualified Stock Options
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Dividend yield | 2.28% |
| Expected volatility | 52.23% |
| Risk-free interest rate | 1.69% |
| Expected term (years) | 6 years |
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Market-Based Restricted Common Shares
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Dividend yield | 2.28% |
| Expected volatility | 53.40% |
| Risk-free interest rate | 1.41% |