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
Dec. 26, 2020
Sep. 26, 2020
Dec. 28, 2019
Inventory Disclosure [Abstract]      
Raw materials $ 167,135 $ 152,692 $ 156,464
Work in progress 58,175 49,312 68,489
Finished goods 335,086 218,847 314,213
Supplies 14,482 18,764 17,313
Total inventories, net $ 574,878 $ 439,615 $ 556,479