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Debt (Narrative) (Details) - USD ($)
shares in Millions
1 Months Ended 12 Months Ended
Oct. 15, 2013
Jul. 31, 2015
Apr. 30, 2015
Oct. 03, 2015
Sep. 27, 2014
Apr. 07, 2015
Sep. 30, 2008
Debt Instrument [Line Items]              
Maturities of debt in 2016       $ 715,000,000      
Maturities of debt in 2017       79,000,000      
Maturities of debt in 2018       627,000,000      
Maturities of debt in 2019       1,559,000,000      
Maturities of debt in 2020       285,000,000      
Maximum borrowing capacity under credit facility       1,250,000,000.00      
Amount available for borrowing under credit facility       $ 1,244,000,000      
3.25% Convertible senior notes due October 2013 [Member]              
Debt Instrument [Line Items]              
Debt instrument, face amount             $ 458,000,000
Interest rate             3.25%
Repayments of Long-term Debt $ 458,000,000            
2.75% Senior notes due September 2015 [Member]              
Debt Instrument [Line Items]              
Interest rate       2.75%      
Repayments of Debt   $ 401,000,000          
Class A [Member] | 3.25% Convertible senior notes due October 2013 [Member]              
Debt Instrument [Line Items]              
Stock Issued During Period, Shares, Conversion of Convertible Securities 11.7            
Stock Redeemed or Called During Period, Shares 11.7            
Class A [Member] | 2008 Warrants [Member]              
Debt Instrument [Line Items]              
Stock Issued During Period, Shares, Treasury Stock Reissued         11.7    
Standby Letters of Credit [Member]              
Debt Instrument [Line Items]              
Letters of credit issued amount       $ 6,000,000      
Bilateral Letters Of Credit [Member]              
Debt Instrument [Line Items]              
Letters of credit issued amount       $ 93,000,000      
Term Loan [Member] | 3-Year Tranche B [Member]              
Debt Instrument [Line Items]              
Interest rate       1.31%      
Loans Payable to Bank           $ 500,000,000  
Debt Instrument, Term     3 years 3 years      
Loans Receivable, Basis Spread on Variable Rate           1.125%  
Term Loan [Member] | 3-Year Tranche A [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Term       3 years