Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Sep. 30, 2020
Inventory Net [Abstract]
Raw materials		$ 122,056	$ 123,626
Work in progress		92,124	92,934
Component parts	[1]	254,042	255,980
Finished goods		70,321	66,889
Customer supplied inventory		15,790	14,955
On-hand inventory for which control has transferred to the customer		132,012	116,441
Inventory, net		$ 422,321	$ 437,943

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