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Fair Value Measurements - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Mar. 29, 2014
Dec. 28, 2013
Sep. 28, 2013
Mar. 29, 2014
Mar. 30, 2013
Fair Value Measurement [Line Items]          
Impairment charge     $ 700,000 $ 28,600,000  
Impairment charge allocated to intangible assets       27,100,000  
Impairment charge allocated to property and equipment       33,308,000 47,000
Asset impairment charge   3,100,000      
Cost-method equity investments in non-publicly traded securities 8,700,000   12,600,000 8,700,000  
Other-than-temporary impairment charges 3,000,000     3,700,000  
Fair value of Senior Notes 1,060,000,000     1,060,000,000  
Property and equipment [Member]
          
Fair Value Measurement [Line Items]          
Impairment charge allocated to property and equipment       1,500,000  
Cost of product revenues [Member]
          
Fair Value Measurement [Line Items]          
Impairment charge allocated to property and equipment       300,000  
General and Administrative Expenses [Member]
          
Fair Value Measurement [Line Items]          
Impairment charge allocated to property and equipment       1,200,000  
Level Three Investments [Member]
          
Fair Value Measurement [Line Items]          
Other-than-temporary impairment charges       1,700,000  
Credit Agreement [Member]
          
Fair Value Measurement [Line Items]          
Borrowed principal under credit agreement $ 2,080,000,000     $ 2,080,000,000