Inventories (Activity in Reserves for Excess and Obsolete Inventory) (Details) - SEC Schedule, 12-09, Reserve, Inventory [Member] - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance beginning of period	$ (13,370)	$ (9,313)	$ (10,599)
Additions charged to expense	(310)	(5,754)	(419)
Write-offs	2,197	1,541	104
Foreign currency and other	16	156	1,601
Valuation allowance end of period	$ (11,467)	$ (13,370)	$ (9,313)