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Acquisitions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Business Acquisition [Line Items]      
Total cash paid, net of cash acquired $ 0 $ 14,300 $ 84,022
2014 Acquisitions      
Business Acquisition [Line Items]      
Total acquisition price   14,500  
Allocation of the acquisition:      
Accounts receivable and prepaid expenses   734  
Property and equipment   71  
Inventory   81  
Intangible assets   6,071  
Goodwill   7,682  
Liabilities assumed   (171)  
Fair value of net assets and liabilities acquired   $ 14,468  
2013 Acquisitions      
Business Acquisition [Line Items]      
Total cash paid, net of cash acquired     83,866
Contingent consideration     3,092
Total acquisition price     86,958
Allocation of the acquisition:      
Accounts receivable and prepaid expenses     21,082
Deferred income taxes     2,845
Vehicle pooling costs     1,187
Property and equipment     21,158
Inventory     634
Intangible assets     24,186
Goodwill     72,666
Liabilities assumed     (56,800)
Fair value of net assets and liabilities acquired     $ 86,958