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Long-Term Debt (Narrative) (Details) (USD $)
9 Months Ended 0 Months Ended 9 Months Ended 9 Months Ended
Feb. 24, 2013
Revolving Credit Agreement
Feb. 24, 2013
Revolving Credit Facility
Revolving Credit Agreement
Aug. 28, 2012
Unsecured Debt
Oct. 04, 2012
Unsecured Debt
New Senior Notes
Aug. 28, 2012
Unsecured Debt
3.790% Senior Notes Due August 2019
Aug. 28, 2012
Unsecured Debt
4.520% Senior Notes Due August 2024
Feb. 24, 2013
Commercial Paper
Revolving Credit Agreement
Feb. 24, 2013
Senior Notes
Adjustment
Aug. 22, 2012
Senior Notes
Term Loan Agreement
Feb. 24, 2013
Senior Notes
6.200% Senior Notes Due October 2017
Feb. 24, 2013
Senior Notes
6.800% Senior Notes Due October 2037
Feb. 24, 2013
Senior Notes
Maximum
Feb. 24, 2013
Libor
Revolving Credit Facility
Revolving Credit Agreement
Feb. 24, 2013
Base Rate Loans
Revolving Credit Facility
Revolving Credit Agreement
Maximum borrowing available under the credit facility   $ 750,000,000.0                        
Total debt to total capitalization ratio   0.75 0.75           0.75          
Expiration date of credit facility Oct. 03, 2016                          
Base interest rate percentage of revolving credit facility in addition to federal funds rate   0.50%                        
Applicable interest rate assuming a BBB equivalent credit rating level                         1.075% 0.075%
Amount outstanding under credit facility   0         216,900,000              
Remaining credit available   533,100,000                        
Face amount of debt       450,000,000 80,000,000 220,000,000     300,000,000.0 500,000,000.0 300,000,000.0      
Interest rate of debt       3.35% 3.79% 4.52%       6.20% 6.80%      
Discount and issuance costs       $ 4,700,000                    
Percent of principal amount required to purchase New Senior Notes in event of triggering event       101.00%                    
Annual amortization of principal second anniversary (percentage)                 5.00%          
Annual amortization of principal third anniversary (percentage)                 5.00%          
Annual amortization of principal fourth anniversary (percentage)                 5.00%          
Annual amortization of principal fifth anniversary (percentage)                 85.00%          
Maturity date of debt                   Oct. 01, 2017 Oct. 01, 2037      
Maximum range of interest rate adjustment on funds borrowed                       2.00%    
Adjustments made to interest rates on funds borrowed               0