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Accounts Receivable, Net (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable, gross, current $ 185,397 $ 140,820    
Less allowance for doubtful accounts (2,683) (2,920) (3,122) (2,841)
Accounts receivable, net 182,714 137,900    
Advance charges receivable
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable, gross, current 118,584 85,237    
Trade accounts receivable
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable, gross, current 65,660 53,163    
Other receivables
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts receivable, gross, current $ 1,153 $ 2,420