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Long-Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 29, 2018
Sep. 29, 2017
Debt Instrument [Line Items]    
Credit facility $ 25,000 $ 50,000
Government refundable advances 44,068 45,549
Obligation under capital leases 69,817 71,091
Debt issuance costs (3,920) (4,654)
Total long-term debt 736,129 776,848
Less current maturities 15,245 17,424
Carrying amount of long-term debt 720,884 759,424
U.S. Credit Facility    
Debt Instrument [Line Items]    
Credit facility 25,000 50,000
U.S. Term Loan, due April 2020    
Debt Instrument [Line Items]    
Term Loan 215,625 225,000
3.625% Senior Notes, due April 2023    
Debt Instrument [Line Items]    
Senior Notes $ 385,539 $ 389,862