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Acquisitions (Tables)
 12 Months Ended
Jul. 31, 2013
Business Combinations [Abstract]  
Schedule of preliminary purchase price allocation based on the estimated fair values of the assets acquired and liabilities assumed
 
Total cash paid, net of cash acquired
               $ 84,022   
Contingent consideration
                  3,869   
Total acquisition price
               $ 87,891   
Allocation of the acquisition price:
                        
Accounts receivable and prepaid expenses
                  15,348   
Deferred income taxes
                  5,890   
Vehicle pooling costs
                  1,187   
Property and equipment
                  21,158   
Inventory
                  594    
Intangible assets
                  14,922   
Goodwill
                  73,414   
Liabilities assumed
                  (44,622 )  
Fair value of net assets and liabilities acquired
               $ 87,891