Pension Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss expected to be recognized in the following year		$ 2,400
Actual return on plan assets gain (loss)		1,000	$ 6,300	$ 1,700
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 2,500	2,000	2,000
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plans, vesting period		1 year
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plans, vesting period		5 years
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost	$ 1,200
Foreign Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return		5.44%
Net periodic pension cost		$ 912	2,564	$ 1,955
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 2,459	$ 2,036
Foreign Plan [Member] | Pension Plan [Member] | Germany [Member]
Defined Benefit Plan Disclosure [Line Items]
Current asset allocation target for equity securities		60.00%
Current asset allocation target for fixed income securities		40.00%
Foreign Plan [Member] | Pension Plan [Member] | Other International [Member]
Defined Benefit Plan Disclosure [Line Items]
Current asset allocation target for fixed income securities		100.00%