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CAPITAL STOCK AND STOCK-BASED AWARDS (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 49 Months Ended 12 Months Ended
May 31, 2012
May 31, 2012
May 31, 2011
May 31, 2010
May 31, 2012
Other Employees [Member]
Plan 2011 [Member]
May 31, 2012
1995 Plan [Member]
May 31, 2012
2001 Plan [Member]
May 31, 2012
Plan 2011 [Member]
May 31, 2012
1997 Directors’ Plan [Member]
May 31, 2012
2007 Directors’ Plan [Member]
Sep. 30, 2011
2007 Directors’ Plan [Member]
Sep. 30, 2007
2007 Directors’ Plan [Member]
May 31, 2012
Class A Stock Options [Member]
May 31, 2012
Stock Options [Member]
Management Stock Purchase Plan [Member]
May 31, 2012
Restricted Stock Units (RSUs) [Member]
Management Stock Purchase Plan [Member]
May 31, 2012
Restricted Stock Units (RSUs) [Member]
May 31, 2012
Management Stock Purchase Plan [Member]
May 31, 2011
Management Stock Purchase Plan [Member]
May 31, 2010
Management Stock Purchase Plan [Member]
Non Qualified Stock Options To Purchase           198,740 2,354,423 610,912 6,000     3,000              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures   646,552     395,380     224,172   27,000                  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)   $ 28.38     $ 28.47     $ 28.18                      
Common Stock Available For Additional Awards               1,285,278   333,800                  
Options To Purchase                 174,000                    
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock Units                     1,200                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in Dollars per share)   $ 27.75               $ 26.73                  
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock Units Grants In Period   205,620 141,600 401,541           10,800                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 4,948,075 4,948,075 5,404,866             111,000     1,499,000            
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars) $ 3.1 $ 3.1                         $ 0.1 $ 5.6      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition                           2 years 1 year 6 months 2 years 6 months      
Stock Issued During Period, Shares, Conversion of Units   255,684                                  
Deferred Rate For Annual Cash Bonus Payment                                 100.00%    
Quarterly Basis Discount Rate Of Common Stock On Closing Price 15.00%                               25.00%    
Common Stock Remaining Authorized Under Management Stock Purchase Plan 468,372 468,372                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value (in Dollars)                                 $ 6.0 $ 4.1 $ 2.6
Common Stock Remaining Authorized Under EmployeeS tock Purchase Plan 287,973 287,973