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Comprehensive Income (Tables)
6 Months Ended
Jan. 31, 2012
Statement Of Income and Comprehensive Income [Abstract]  
Reconciles net income to comprehensive income


 

                                                     
              Three Months Ended January 31,           Six Months Ended January 31,  
              2012           2011           2012           2011  
  Net income, as reported         $ 40,603         $ 37,893         $ 81,752         $ 75,719  
  Other comprehensive income:                                                  
  Interest rate swap, net of tax effects           (2,459 )         -           (3,073 )         -  
  Foreign currency translation adjustments, net of tax effects           (6,114 )         (1,091 )         (9,614 )         3,167  
  Total comprehensive income         $ 32,030         $ 36,802         $ 69,065         $ 78,886