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LONG-TERM DEBT - Repurchase of Debt Securities (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 28, 2017
Sep. 22, 2017
Apr. 15, 2016
Mar. 01, 2016
Jun. 11, 2015
May 31, 2013
Sep. 30, 2017
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Nov. 02, 2017
Dec. 31, 2012
Feb. 28, 2007
Debt Instrument [Line Items]                                
Proceeds from debt issuances                     $ 325,000,000 $ 0 $ 225,000,000      
Net loss on debt extinguishment             $ 22,000,000                  
Convertible Notes | 3.25% convertible notes due 2037                                
Debt Instrument [Line Items]                                
Proceeds from debt issuances   $ 317,000,000                            
Stated interest rate             3.25%       3.25%          
Debt             $ 317,000,000       $ 317,000,000 0        
Debt instrument, face amount   325,000,000                            
Convertible Notes | 7.875% convertible notes due 2026                                
Debt Instrument [Line Items]                                
Stated interest rate             7.875%       7.875%          
Extinguishment of debt, amount   117,000,000           $ 25,000,000 $ 85,000,000       110,000,000      
Debt   $ 140,000,000         $ 22,000,000       $ 22,000,000 129,000,000        
Repurchase price percentage   130.00%           58.00% 64.00%              
Net loss on debt extinguishment   $ 23,000,000                     24,000,000      
Debt instrument, face amount                             $ 250,000,000  
Repurchased principal amount of debt         $ 110,000,000     $ 110,000,000         110,000,000      
Redemption price                     100.00%          
Repayments of convertible debt         $ 179,000,000               179,000,000      
Carrying amount of liability component               121,000,000         121,000,000      
Carrying amount of equity component             $ 23,000,000 58,000,000     $ 23,000,000   58,000,000      
Unamortized discount and deferred issuance costs               $ 14,000,000         14,000,000      
Redemption premium                         10,000,000      
Convertible Notes | 4.00% convertible notes due 2027                                
Debt Instrument [Line Items]                                
Stated interest rate             4.00%       4.00%          
Extinguishment of debt, amount   119,000,000             $ 4,000,000 $ 15,000,000     $ 19,000,000      
Debt   $ 143,000,000         $ 24,000,000       $ 24,000,000 $ 142,000,000        
Repurchase price percentage   16.00%                            
Net loss on debt extinguishment   $ 8,000,000                            
Debt instrument, face amount                               $ 200,000,000
Redemption price                 5.00% 6.00% 100.00%          
Convertible Notes | 7.875% and 4.00% convertible notes                                
Debt Instrument [Line Items]                                
Net loss on debt extinguishment   $ 31,000,000                            
Convertible Notes | 4.625% convertible notes due 2026                                
Debt Instrument [Line Items]                                
Stated interest rate     462.50%                 4.625%        
Debt                             300,000,000  
Repurchase price percentage                       100.00%        
Repurchased principal amount of debt       $ 55,000,000               $ 55,000,000     $ 245,000,000  
Redemption price     100.00% 100.00%                        
Senior Notes | 6.75% notes due 2021                                
Debt Instrument [Line Items]                                
Proceeds from debt issuances           $ 275,000,000                    
Stated interest rate             6.75%       6.75%          
Extinguishment of debt, amount $ 100,000,000                              
Debt             $ 173,000,000       $ 173,000,000 $ 271,000,000        
Net loss on debt extinguishment                     $ 5,000,000          
Debt instrument, face amount           $ 275,000,000                    
Redemption premium $ 1,033.75                              
Senior Notes | 6.75% notes due 2021 | Subsequent Event                                
Debt Instrument [Line Items]                                
Redemption premium                           $ 1,033.75    
Repurchased principal amount of debt                           $ 175,000,000