Revenue (Narrative - Performance Obligations) (Details1) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Remaining performance obligation amount	$ 1,283,311	$ 1,454,406
Material Rights [Member]
Remaining performance obligation amount	$ 471,133
Material Rights [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-10-01
Period of remaining performance obligation, expected timing of satisfaction	1 year
Remaining performance obligation amount	$ 11,265
Remaining performance obligation, expected timing of satisfaction, year	2022
Maximum [Member] | Material Rights [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-10-01
Period of remaining performance obligation, expected timing of satisfaction	40 years
Aerospace [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-10-01
Period of remaining performance obligation, expected timing of satisfaction	2 years