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Intangible Assets | 9 Months Ended
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Feb. 28, 2013
Intangible Assets | 7. INTANGIBLE ASSETS A summary of intangible assets as of February 28, 2013 and May 31, 2012 is as follows (in thousands):
|  | February 28, 2013 |  |  | May 31, 2012 |
|  | (unaudited) |  |  |  |  |  |  |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Customer relationships |  | $ | 21,462 |  |  | $ | (3,559 | ) |  | $ | 17,903 |  |  | $ | 12,198 |  |  | $ | (1,973 | ) |  | $ | 10,225 |
Non-compete agreements |  |  | 3,719 |  |  |  | (3,164 | ) |  |  | 555 |  |  |  | 3,136 |  |  |  | (2,844 | ) |  |  | 292 |
Trade names |  |  | 4,075 |  |  |  | (362 | ) |  |  | 3,713 |  |  |  | 2,962 |  |  |  | (207 | ) |  |  | 2,755 |
Technology |  |  | 5,112 |  |  |  | (1,033 | ) |  |  | 4,079 |  |  |  | 5,112 |  |  |  | (634 | ) |  |  | 4,478 |
Licenses |  |  | 649 |  |  |  | — |  |  |  | 649 |  |  |  | 758 |  |  |  | — |  |  |  | 758 |
Total |  | $ | 35,017 |  |  | $ | (8,118 | ) |  | $ | 26,899 |  |  | $ | 24,166 |  |  | $ | (5,658 | ) |  | $ | 18,508 |
Amortization expense for the three months ended February 28, 2013 and February 29, 2012 was $0.8 million and $0.9 million, respectively. Amortization expense for the nine months ended February 28, 2013 and February 29, 2012 was $2.5 million and $2.0 million, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44, 45, 46 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16373-109275 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 + Details
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