Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) (USD $)
12 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 29, 2012
Commitments and Contingencies Disclosure [Abstract]      
Outstanding letters of credit $ 12,600,000    
Restricted cash and cash equivalents 14,283,000 0  
Estimated annual purchase commitments for fiscal 2015 98,500,000    
Estimated annual purchase commitments for fiscal 2016 35,000,000    
Estimated annual purchase commitments for fiscal 2017 20,500,000    
Estimated annual purchase commitments for fiscal 2018 13,400,000    
Estimated annual purchase commitments for fiscal 2019 7,400,000    
Estimated annual purchase commitments for thereafter 1,900,000    
Minimum operating lease agreement terms 1 year    
Maximum operating lease agreement terms 7 years    
Operating lease rental expense $ 21,300,000 $ 22,400,000 $ 23,600,000