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Inventories - Components of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 27, 2019
Sep. 28, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 59,184 $ 71,408
Work-in-process 13,799 13,466
Finished goods 34,897 37,963
Total $ 107,880 $ 122,837