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Changes in Carrying Amount of Accrued Product Warranty Costs (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2017
Sep. 30, 2016
Payables And Accruals [Abstract]    
Balance, beginning of year $ 13,365 $ 14,658
Warranty costs incurred (1,875) (2,423)
Product warranty accrual 4,658 6,850
Release of reserves (1,907) (5,700)
Foreign currency translation adjustment 448 (20)
Balance, end of year $ 14,689 $ 13,365