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Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Less allowance for doubtful accounts $ (2,988) $ (3,584) $ (2,683) $ (2,920)
Accounts receivable, gross, current 218,684 200,569    
Accounts receivable, net 215,696 196,985    
Advance charges receivable        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable, gross, current 143,724 126,307    
Trade accounts receivable        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable, gross, current 73,773 72,170    
Other receivables        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable, gross, current $ 1,187 $ 2,092