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Income Taxes (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Nov. 30, 2013 | May 31, 2013 | Nov. 30, 2012 | Nov. 30, 2013 | Nov. 30, 2012
Income Taxes |  |  |  |  |
Effective income tax rate (as a percent) | 20.00% |  | 13.90% | 19.00% | 15.30%
Asset impairment charges |  | $ 12,049,000 |  | $ 12,049,000 |
Tax benefit related to asset impairment charges |  | $ 20,000 |  |  |

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