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Revenues and Total Assets in United States and Other Countries (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Aug. 31, 2013 | Aug. 31, 2012 | May 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | $ 174,311 | $ 161,492 |
Assets | 465,390 | 460,203 | 460,203
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 123,805 | 113,054 |
Assets | 341,761 | 334,579 |
Canada |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 32,928 | 35,086 |
Assets | 64,844 | 68,164 |
Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 8,433 | 6,700 |
Assets | 36,268 | 35,734 |
Other Foreign Countries |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 9,145 | 6,652 |
Assets | $ 22,517 | $ 21,726 |

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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