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Inventories (Schedule of Inventory) (Details) - USD ($)
$ in Thousands
Mar. 30, 2019
Sep. 30, 2018
Sep. 29, 2018
Inventory Disclosure [Abstract]      
Raw materials and purchased parts $ 173,916   $ 197,071
Work in progress 244,948   240,885
Finished goods 70,203   74,566
Inventories $ 489,067 $ 446,531 $ 512,522