Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

v3.8.0.1
Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Commitments and Contingencies Disclosure [Abstract]      
Outstanding letters of credit $ 1,800    
Restricted cash 12,645 $ 10,910  
Estimated annual purchase commitments for fiscal 2018 104,400    
Estimated annual purchase commitments for fiscal 2019 31,300    
Estimated annual purchase commitments for fiscal 2020 18,900    
Estimated annual purchase commitments for fiscal 2021 11,400    
Estimated annual purchase commitments for fiscal 2022 4,300    
Estimated annual purchase commitments for thereafter $ 800    
Minimum operating lease agreement terms 1 year    
Maximum operating lease agreement terms 12 years    
Operating lease rental expense $ 31,700 $ 25,000 $ 23,100