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Comprehensive Income (Details) (USD $)
 3 Months Ended 6 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Nov. 30, 2011
Nov. 30, 2010
Comprehensive Income        
Net income $ 74,350,000 $ 55,866,000 $ 142,988,000 $ 117,143,000
Other comprehensive income:        
Foreign currency translation adjustment (20,764,000) 10,025,000 (20,546,000) 13,374,000
Change in fair value of derivatives 27,000 (19,000) 181,000 (625,000)
Amortization of interest rate lock agreements 377,000 191,000 754,000 383,000
Change in fair value of available- for-sale securities 7,000 1,000 25,000 28,000
Comprehensive income 53,997,000 66,064,000 123,402,000 130,303,000
Less than
        
Comprehensive income tax expenses and benefits line items        
Tax expense (benefit) for change in the fair value of derivatives 100,000 (100,000) 100,000 (400,000)
Tax expense for change in fair value of available-for-sale securities $ 100,000 $ 100,000 $ 100,000 $ 100,000