Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Sep. 30, 2019
Inventories
Raw materials		$ 142,911	$ 134,878
Work in progress		136,873	133,885
Component parts	[1]	285,792	287,128
Finished goods		72,483	59,051
Customer supplied inventory		10,298	13,396
On-hand inventory for which control has transferred to the customer		(128,091)	(111,502)
Inventory, net		$ 520,266	$ 516,836

[1] Component parts include items that can be sold separately as finished goods or included in the manufacture of other products.