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Acquisitions (Tables)
3 Months Ended
Oct. 31, 2013
Acquisitions [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
  $ 84,316  
Contingent consideration
    3,869  
Total acquisition price
  $ 88,185  
Allocation of the acquisition price:
       
Accounts receivable and prepaid expenses
  $ 20,348  
Deferred income taxes
    3,096  
Vehicle pooling costs
    1,187  
Property and equipment
    21,158  
Inventory
    594  
Intangible assets
    14,922  
Goodwill
    83,013  
Liabilities assumed
    (56,133 )
Fair value of net assets and liabilities acquired
  $ 88,185