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Allowance for Doubtful Accounts
 12 Months Ended
May 31, 2011
Allowance for Doubtful Accounts  
Allowance for Doubtful Accounts

17. Allowance for Doubtful Accounts

 
   May 31,  
 
   2011   2010   2009  

Balance, beginning of year

   $ 4,773   $ 4,677   $ 5,977  
 

Provision charged to operations

     1,315     2,505     4,762  
 

Deductions for accounts written off, net of recoveries

     (369 )   (2,409 )   (6,062 )
               

Balance, end of year

   $ 5,719   $ 4,773   $ 4,677