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Revenue (Narrative - Performance Obligations) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | ---
Remaining performance obligation amount | $ 1,562,813 | $ 1,527,437
Material Rights [Member] |  |
Remaining performance obligation amount | 434,437 |
Material Rights [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01 |  |
Remaining performance obligation amount | $ 9,781 |
Remaining performance obligation, expected timing of satisfaction, year | 2020 |
Period of remaining performance obligation, expected timing of satisfaction | 9 months |
Material Rights [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01 |  |
Remaining performance obligation amount | $ 11,204 |
Remaining performance obligation, expected timing of satisfaction, year | 2021 |
Period of remaining performance obligation, expected timing of satisfaction | 1 year 9 months |
Maximum [Member] | Material Rights [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |  |
Period of remaining performance obligation, expected timing of satisfaction | 40 years |
Aerospace [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |  |
Period of remaining performance obligation, expected timing of satisfaction | 2 years |

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