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Current Liabilities (Details)
Feb. 17, 2012
USD ($)
Jan. 31, 2016
USD ($)
Current Liabilities (Textuals)    
Line of credit facility, increase limit $ 250,000,000  
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)    
Unsecured revolving credit facility $ 500,000,000  
Long-term line of credit, outstanding   $ 745,000,000
Short-term debt   $ 245,000,000