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Current Liabilities (Details)
Feb. 17, 2012
USD ($)
Oct. 31, 2015
USD ($)
Jul. 31, 2015
USD ($)
Current Liabilities (Textuals)      
Unsecured revolving credit facility $ 500,000,000    
Borrowings under credit facility   $ 350,000,000 $ 0
Line of Credit New      
Current Liabilities (Textuals)      
Maximum ratio of debt to annual earnings before interest, taxes, depreciation and amortization as per agreement (not greater than) 3.25    
Minimum ratio of annual earnings before interest, taxes, depreciation and amortization to interest payable as per agreement (not less than) 3.00    
JP Morgan Alternate Base | Line of Credit | Minimum      
Current Liabilities (Textuals)      
Basis spread on variable rate 0.00%    
JP Morgan Alternate Base | Line of Credit | Maximum      
Current Liabilities (Textuals)      
Basis spread on variable rate 0.50%    
LIBOR | Line of Credit | Minimum      
Current Liabilities (Textuals)      
Basis spread on variable rate 0.90%    
LIBOR | Line of Credit | Maximum      
Current Liabilities (Textuals)      
Basis spread on variable rate 1.50%    
Revolving Credit Facility | Unsecured Debt      
Current Liabilities (Textuals)      
Borrowings under credit facility   350,000,000  
Line of credit facility, remaining borrowing capacity   $ 150,000,000