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Fair Value of Derivative Instrument Reported in Condensed Consolidated Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 28, 2013
Sep. 28, 2012
Derivatives Fair Value [Line Items]    
Asset derivatives $ 1.1 $ 0.8
Liability derivatives      
Prepaid expenses and other current assets
   
Derivatives Fair Value [Line Items]    
Asset derivatives, not designated as hedging instruments 1.1  
Accrued liabilities
   
Derivatives Fair Value [Line Items]    
Liability derivatives      
Derivatives designated as hedging instruments | Prepaid expenses and other current assets
   
Derivatives Fair Value [Line Items]    
Asset derivatives   0.8
Derivatives designated as hedging instruments | Accrued liabilities
   
Derivatives Fair Value [Line Items]    
Liability derivatives