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Allowance for Doubtful Accounts
 12 Months Ended
May 31, 2012
Allowance for Doubtful Accounts  
Allowance for Doubtful Accounts

17. Allowance for Doubtful Accounts

 
   May 31,  
 
   2012   2011   2010  

Balance, beginning of year

   $ 5,719   $ 4,773   $ 4,677  

Provision charged to operations

     2,359     1,315     2,505  

Deductions for accounts written off, net of recoveries

     (1,551 )   (369 )   (2,409 )
               

Balance, end of year

   $ 6,527   $ 5,719   $ 4,773