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LONG-TERM DEBT LONG-TERM DEBT - CREDIT AGREEMENT (2011 AGREEMENT) (Details) (USD $)
Jul. 31, 2014
Apr. 30, 2011
April 2011 Term Loans
   
Debt Instrument    
Long-term Debt, Gross $ 600,000,000  
2011 Revolving Line of Credit
   
Debt Instrument    
Line of Credit Facility, Maximum Borrowing Capacity 170,000,000  
2011 Credit Agreement
   
Debt Instrument    
Line of Credit Facility, Maximum Borrowing Capacity 770,000,000  
Line of Credit Facility, Additional Borrowing Capacity   300,000,000
Deferred debt issuance costs, gross   $ 14,800,000