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Note 6 - Long Term Debt (Details Textual)
12 Months Ended 19 Months Ended
Aug. 06, 2014
USD ($)
Jul. 17, 2014
USD ($)
Feb. 25, 2017
USD ($)
Feb. 27, 2016
USD ($)
Feb. 28, 2015
USD ($)
Feb. 27, 2016
USD ($)
Proceeds from Issuance of Long-term Debt     $ 1,500,000,000  
Line of Credit Facility, Number of Uncommitted Lines of Credit Maintained     2      
Letters of Credit Outstanding, Amount     $ 14,000,000      
Unsecured Stand-by Letters of Credit, Amount     44,900,000      
Uncommitted Line of Credit Expiring February 26, 2017 [Member]            
Line of Credit Facility, Maximum Borrowing Capacity     100,000,000      
Uncommitted Lines of Credit [Member]            
Proceeds from Lines of Credit     0 0    
Uncommitted Line of Credit Expiring August 30, 2017 [Member]            
Line of Credit Facility, Maximum Borrowing Capacity     100,000,000      
Revolver [Member] | Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity $ 250,000,000          
Debt Instrument, Term 5 years          
Proceeds from Lines of Credit     0 0    
Revolver [Member] | Revolving Credit Facility [Member] | Federal Funds Effective Swap Rate [Member]            
Debt Instrument, Basis Spread on Variable Rate 0.50%          
Revolver [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate 1.00%          
Senior Unsecured Notes and Revolver [Member]            
Interest Expense     $ 73,400,000 $ 73,000,000   $ 44,900,000
Senior Unsecured Notes and Revolver [Member] | Other Assets [Member]            
Debt Issuance Costs, Gross $ 10,100,000          
Senior Unsecured Notes [Member]            
Proceeds from Issuance of Long-term Debt   $ 1,500,000,000        
Debt Instrument Change in Control Offer to Purchase Principal Amount, Percentage   101.00%        
Senior Unsecured Notes [Member] | The 2024 Notes [Member]            
Debt Instrument, Face Amount   $ 300,000,000        
Debt Instrument, Interest Rate, Stated Percentage   3.749%        
Senior Unsecured Notes [Member] | The 2034 Notes [Member]            
Debt Instrument, Face Amount   $ 300,000,000        
Debt Instrument, Interest Rate, Stated Percentage   4.915%        
Senior Unsecured Notes [Member] | The 2044 Notes [Member]            
Debt Instrument, Face Amount   $ 900,000,000        
Debt Instrument, Interest Rate, Stated Percentage   5.165%