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Changes in Carrying Amount of Accrued Product Warranty Costs (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Payables And Accruals [Abstract]    
Balance, beginning of year $ 14,689 $ 13,365
Warranty costs incurred (2,146) (1,875)
Product warranty accrual 7,613 4,658
Release of reserves (5,398) (1,907)
Foreign currency translation adjustment (273) 448
Balance, end of year $ 14,485 $ 14,689