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Changes In Equity (Schedule Of Changes In Total Equity, Shareholders' Equity Attributable To Controlling Interest, And Equity Attributable To Noncontrolling Interest To Controlling Interest And Noncontrolling Interest) (Details) (USD $)
In Thousands
3 Months Ended
Aug. 31, 2011
Aug. 31, 2010
Balance, Beginning $ 740,703  
Comprehensive income 26,006 [1]  
Common shares issued 8,208  
Stock-based compensation 3,566  
Purchases and retirement of common shares (35,405)  
Payments to noncontrolling interest (3,120) (3,120)
Cash dividends declared (8,463)  
Balance, Ending 731,495  
Additional Paid-In Capital [Member]
   
Balance, Beginning 181,525  
Common shares issued 8,208  
Stock-based compensation 3,566  
Purchases and retirement of common shares (5,570)  
Balance, Ending 187,729  
Accumulative Other Comprehensive Income (Loss), Net Of Tax [Member]
   
Balance, Beginning 3,975  
Comprehensive income (1,514) [1]  
Balance, Ending 2,461  
Retained Earnings [Member]
   
Balance, Beginning 504,410  
Comprehensive income 25,653 [1]  
Purchases and retirement of common shares (29,835)  
Cash dividends declared (8,463)  
Balance, Ending 491,765  
Total [Member]
   
Balance, Beginning 689,910  
Comprehensive income 24,139 [1]  
Common shares issued 8,208  
Stock-based compensation 3,566  
Purchases and retirement of common shares (35,405)  
Cash dividends declared (8,463)  
Balance, Ending 681,955  
Non-Controlling Interest [Member]
   
Balance, Beginning 50,793  
Comprehensive income 1,867 [1]  
Payments to noncontrolling interest (3,120)  
Balance, Ending $ 49,540  
[1] The allocation of the components of comprehensive income attributable to controlling and noncontrolling interests is disclosed in "NOTE G - Comprehensive Income."