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Receivables (Tables) | 9 Months Ended
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Feb. 28, 2013
Receivable | A summary of accounts receivable as of February 28, 2013 and May 31, 2012 is as follows (in thousands):
|  | February 28, 2013 |  |  | May 31, 2012 |
|  | (unaudited) |  |  |  |
Trade accounts receivable |  | $ | 139,757 |  |  | $ | 141,469 |
Unbilled revenues |  |  | 20,569 |  |  |  | 20,561 |
Allowance for doubtful accounts |  |  | (5,352 | ) |  |  | (4,405 | )
Total |  | $ | 154,974 |  |  | $ | 157,625 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 + Details
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