Quarterly report pursuant to Section 13 or 15(d)

Inventories, net - Summary of Inventories, Net of Allowance for Obsolescence (Details)

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Inventories, net - Summary of Inventories, Net of Allowance for Obsolescence (Details) - USD ($)
$ in Thousands
Mar. 28, 2020
Sep. 28, 2019
Mar. 30, 2019
Inventory Disclosure [Abstract]      
Raw materials $ 148,730 $ 145,331 $ 136,879
Work in progress 66,866 51,154 58,529
Finished goods 286,448 255,870 305,569
Supplies 15,163 13,842 16,181
Total inventories, net $ 517,207 $ 466,197 $ 517,158