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, 2021	Sep. 30, 2020	Sep. 30, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance beginning of period	$ (11,467)	$ (13,370)	$ (9,313)
Change to reserve requirement	265	(310)	(5,754)
Write-offs	1,516	2,197	1,541
Foreign currency and other	(23)	16	156
Valuation allowance end of period	$ (9,709)	$ (11,467)	$ (13,370)