v2.4.0.6
Fair Value Measurements - Additional Information (Detail) (USD $)
6 Months Ended
Mar. 30, 2013
Sep. 29, 2012
Fair Value Measurement [Line Items]    
Cash and cash equivalents, fair value $ 300,000 $ 300,000
Cost-method equity investments in non-publicly traded securities 17,800,000 16,000,000
Other-than-temporary impairment charge 1,700,000  
Fair value of Senior Notes 1,060,000,000  
2007 Notes [Member]
   
Fair Value Measurement [Line Items]    
The aggregate principal amount of the Convertible Notes 405,000,000  
2010 Notes [Member]
   
Fair Value Measurement [Line Items]    
The aggregate principal amount of the Convertible Notes 450,000,000  
2012 Notes [Member]
   
Fair Value Measurement [Line Items]    
The aggregate principal amount of the Convertible Notes 500,000,000  
2013 Notes [Member]
   
Fair Value Measurement [Line Items]    
The aggregate principal amount of the Convertible Notes 370,000,000  
Credit Agreement [Member]
   
Fair Value Measurement [Line Items]    
Borrowed principal under Credit Agreement 2,470,000,000  
Convertible Notes [Member]
   
Fair Value Measurement [Line Items]    
Convertible Notes 1,560,000,000 1,560,000,000
The aggregate principal amount of the Convertible Notes $ 1,725,000,000 $ 1,725,000,000