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Income Taxes - Additional Information (Detail)
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9 Months Ended | |
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Feb. 28, 2014
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Feb. 28, 2013
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| Income Taxes [Line Items] | ||
| Estimated annual effective income tax rate | 27.30% | 31.80% |
| Percentage of tax expense of TWB's foreign operations of acquiree since consolidation date included in reported income tax expense | 100.00% | |