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Venezuela's Highly Inflationary Economy - Additional Information (Detail) (USD $) | 3 Months Ended |  |  | 3 Months Ended |
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Aug. 31, 2013 | Aug. 31, 2012 | Feb. 28, 2013 | Jan. 31, 2013 | Feb. 28, 2013 Venezuela | Aug. 31, 2013 Venezuela
Investment in Country with High Inflationary Economy [Line Items] |  |  |  |  |  |
Percentage of consolidated revenues from small service location | 1.00% |  |  |  |  |
Official published exchange rate |  |  | 6.30 | 5.30 |  |
Recognized losses related to the Venezuelan currency | $ (390,000) | $ (74,000) |  |  | $ (600,000) |
Net assets of Venezuelan subsidiary |  |  |  |  |  | 2,900,000
Denominated receivables and cash of Venezuelan subsidiary |  |  |  |  |  | $ 1,700,000

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