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Earnings Per Share - Additional Information (Detail)
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3 Months Ended | 9 Months Ended | |
|---|---|---|---|
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Feb. 28, 2014
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Feb. 28, 2014
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Feb. 28, 2013
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Stock options excluded from computation of diluted earnings per share | 9,922 | 8,048 | 673,789 |