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Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 28, 2018
Sep. 29, 2017
Debt Instrument [Line Items]    
Credit facility $ 0 $ 50,000
Government refundable advances 43,873 45,549
Debt issuance costs (3,680) (4,654)
Obligation under capital leases 69,310 71,091
Total long-term debt 672,468 776,848
Less current maturities 17,546 17,424
Carrying amount of long-term debt 654,922 759,424
U.S. Credit Facility    
Debt Instrument [Line Items]    
Credit facility 0 50,000
U.S. Term Loan, due April 2020    
Debt Instrument [Line Items]    
Term Loan 180,000 225,000
3.625% Senior Notes, due April 2023    
Debt Instrument [Line Items]    
Senior Notes $ 382,965 $ 389,862