Pension Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 2,000	$ 2,000	$ 46,700
Pension settlement loss		0	0	66,332
Actuarial loss expected to be recognized in the following year		2,100
Actual return on plan assets gain (loss)		$ 6,300	1,700	1,900
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	$ 800
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer				25,500
Pension settlement loss		$ 0	0	66,332
Net periodic pension cost		0	0	72,136
Foreign Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer		2,036	1,978
Pension settlement loss		$ 0	0	0
Long-term rate of return		5.42%
Net periodic pension cost		$ 2,564	$ 1,955	$ 1,741
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%