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Revenue (Narrative - Performance Obligations) (Details1) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | ---
Remaining performance obligation amount | $ 1,274,218 | $ 1,454,406
Material Rights [Member] |  |
Remaining performance obligation amount | $ 464,296 | $ 465,668
Material Rights [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-10-01 |  |
Period of remaining performance obligation, expected timing of satisfaction | 9 months |
Remaining performance obligation amount | $ 8,952 |
Remaining performance obligation, expected timing of satisfaction, year | 2021 |
Material Rights [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-10-01 |  |
Period of remaining performance obligation, expected timing of satisfaction | 1 year 9 months |
Remaining performance obligation amount | $ 10,625 |
Remaining performance obligation, expected timing of satisfaction, year | 2022 |
Aerospace [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01 |  |
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: 2020-01-01 |  |
Period of remaining performance obligation, expected timing of satisfaction | 40 years |

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