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INVENTORIES, NET - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Mar. 26, 2021
Sep. 30, 2020
Inventory Disclosure [Abstract]    
Purchased materials and manufactured parts, net $ 58,536 $ 49,192
Work in process, net 27,713 24,113
Finished goods, net 151,643 125,790
Inventories, net $ 237,892 $ 199,095