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. 27, 2021
Sep. 26, 2020
Mar. 28, 2020
Inventory Disclosure [Abstract]      
Raw materials $ 189,732 $ 152,692 $ 148,730
Work in progress 102,549 49,312 66,866
Finished goods 366,689 218,847 286,448
Supplies 13,931 18,764 15,163
Total inventories, net $ 672,901 $ 439,615 $ 517,207