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Comprehensive Income (Details) (USD $) | 3 Months Ended
--- | ---
Aug. 31, 2011 | Aug. 31, 2010
Comprehensive Income |  |
Net income | $ 68,638,000 | $ 61,277,000
Other comprehensive income: |  |
Foreign currency translation adjustment | 218,000 | 3,349,000
Change in fair value of derivatives | 153,000 | (606,000)
Amortization of interest rate lock agreements | 377,000 | 192,000
Change in fair value of available- for-sale securities | 18,000 | 27,000
Comprehensive income | 69,404,000 | 64,239,000
Tax expense (benefit) for change in the fair value of derivatives | 100,000 | (400,000)
Tax expense for change in fair value of available-for-sale securities | $ 100,000 | $ 100,000

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