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Allowance for Doubtful Accounts (Tables)
12 Months Ended
May 31, 2012
Allowance for Doubtful Accounts  
Schedule of 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