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Debt (Narrative) (Details) - USD ($)
shares in Millions
12 Months Ended
Oct. 15, 2013
Oct. 01, 2016
Mar. 31, 2016
Oct. 03, 2015
Sep. 30, 2008
Debt Instrument [Line Items]          
Maturities of debt in 2016   $ 79,000,000      
Maturities of debt in 2017   128,000,000      
Maturities of debt in 2018   2,359,000,000      
Maturities of debt in 2019   285,000,000      
Maturities of debt in 2020   10,000,000      
Maximum borrowing capacity under credit facility   1,250,000,000.00      
Amount available for borrowing under credit facility   943,000,000      
6.60% Senior Notes Due April 2016 [Member]          
Debt Instrument [Line Items]          
Senior Notes   $ 0 $ 638,000,000 $ 638,000,000  
Interest rate   6.60%      
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%  
Class A [Member]          
Debt Instrument [Line Items]          
Stock Issued During Period, Shares, Conversion of Convertible Securities   18.8      
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   $ 7,000,000      
Bilateral Letters Of Credit [Member]          
Debt Instrument [Line Items]          
Letters of credit issued amount   91,000,000      
Term Loan [Member] | Tranche B due April 2019 [Member]          
Debt Instrument [Line Items]          
Senior Notes   $ 500,000,000   $ 500,000,000  
Interest rate   1.31%