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Venezuela's Highly Inflationary Economy - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2013 | Feb. 29, 2012 | Feb. 28, 2013 | Feb. 29, 2012 | Jan. 31, 2013
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 |  | 6.30 |  | 5.30
Recognized losses related to the Venezuelan currency | $ (729,000) | $ 90,000 | $ (917,000) | $ (74,000) |
Venezuela |  |  |  |  |
Investment in Country with High Inflationary Economy [Line Items] |  |  |  |  |
Recognized losses related to the Venezuelan currency | 600,000 |  |  |  |
Net assets of Venezuelan subsidiary | 2,800,000 |  | 2,800,000 |  |
Denominated receivables and cash of Venezuelan subsidiary | $ 2,600,000 |  | $ 2,600,000 |  |

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