Employee Benefit Plans Projected Benefit Obligation and Accumulated Benefit Obligation are in Excess of Plan Assets (Details) - Pension Plan [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 46,013	$ 47,389	$ 42,948
Fair value of plan assets	28,638	27,530	$ 25,525
GERMANY
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	46,013	47,389
Accumulated benefit obligation	24,578	25,489
Fair value of plan assets	$ 28,638	$ 27,530