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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Oct. 01, 2018
Sep. 30, 2018
Inventories      
Finished products $ 10,905   $ 7,099
Work in process and inventoried costs under long-term contracts 46,951   63,169
Materials and purchased parts 48,938   23,710
Customer advances     (9,779)
Net inventories 106,794 $ 61,688 84,199
Costs incurred outside the scope of work or in advance of a contract award 5,800   900
General and administrative amounts for certain government contracts remaining in inventory $ 500   $ 2,000