Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Sep. 30, 2020
Inventory Net [Abstract]
Raw materials		$ 113,929	$ 123,626
Work in progress		95,308	92,934
Component parts	[1]	254,501	255,980
Finished goods		71,565	66,889
Customer supplied inventory		17,456	14,955
On-hand inventory for which control has transferred to the customer		(125,267)	(116,441)
Inventory, net		$ 427,492	$ 437,943

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