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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2011 | May 31, 2010 | Feb. 29, 2012 Y | Feb. 28, 2011 | Feb. 28, 2010
Goodwill, intangible and other long-lived assets and impairments |  |  |  |  |
Non-cash impairment charges | $ 1,660,000 | $ 501,000 |  | $ 2,161,000 | $ 900,000
Non-cash impairment charges after tax |  |  |  | 2,100,000 | 890,000
Economic useful lives and amortization of intangible assets |  |  |  |  |
Period over which intangible assets are amortized, low end of range (in years) |  |  | 2 |  |
Period over which intangible assets are amortized, high end of range (in years) |  |  | 30 |  |
Intangible asset amortization |  |  | $ 20,069,000 | $ 9,888,000 | $ 6,128,000
Patent |  |  |  |  |
Capitalized costs in connection with the design and development of products to be covered by patents |  |  |  |  |
Useful life of intangible asset, typical life of patent |  |  | 14 |  |

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