Revenue (Narrative - Performance Obligations) (Details1) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Remaining performance obligation amount	$ 1,388,495	$ 1,283,311
Material Rights [Member]
Remaining performance obligation amount	$ 472,201	$ 471,133
Material Rights [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Period of remaining performance obligation, expected timing of satisfaction	9 months
Remaining performance obligation amount	$ 7,924
Remaining performance obligation, expected timing of satisfaction, year	2022
Material Rights [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-10-01
Period of remaining performance obligation, expected timing of satisfaction	1 year
Remaining performance obligation amount	$ 14,825
Remaining performance obligation, expected timing of satisfaction, year	2023
Aerospace [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Period of remaining performance obligation, expected timing of satisfaction	2 years
Maximum [Member] | Material Rights [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Period of remaining performance obligation, expected timing of satisfaction	40 years