Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Sep. 30, 2020
Inventory Net [Abstract]
Raw materials		$ 124,900	$ 123,626
Work in progress		93,652	92,934
Component parts	[1]	266,018	255,980
Finished goods		66,712	66,889
Customer supplied inventory		16,885	14,955
On-hand inventory for which control has transferred to the customer		122,704	116,441
Inventory, net		$ 445,463	$ 437,943

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