Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Inventories
Finished products	$ 7,099	$ 4,369
Work in process and inventoried costs under long-term contracts	63,169	84,131
Materials and purchased parts	23,710	10,163
Customer advances	(9,779)	(10,948)
Net inventories	84,199	87,715
Costs incurred outside the scope of work or in advance of a contract award	900	4,300
General and administrative amounts for certain government contracts remaining in inventory	$ 2,000	$ 2,500