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Consolidated Condensed Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Aug. 31, 2012 | Aug. 31, 2011
Net income | $ 76,733 |  | $ 68,638 |
Other Comprehensive Income (Loss), Net of Tax: |  |  |  |
Foreign currency translation adjustments | 7,017 |  | 218 |
Change in fair value of derivatives | (151) | [1] | 153 | [1]
Amortization of interest rate lock agreements | 488 |  | 377 |
Change in fair value of available-for-sale securities | (2) | [1] | 18 | [1]
Other comprehensive income | 7,352 |  | 766 |
Comprehensive income | $ 84,085 |  | $ 69,404 |
[1] | Net of less than $0.1 million of tax expense and less than $0.1 million of tax benefit for the three months ended August 31, 2012 and 2011, respectively.

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