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Revenue (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Billed accounts receivable due within | 60 days |  | 60 days |  |
Noncurrent unbilled receivables | $ 22,111 |  | $ 22,111 |  | $ 1,573
Revenue from contract liabilities | 15,962 | $ 10,552 | 19,932 | $ 20,312 |
Remaining performance obligation amount | 1,728,437 |  | 1,728,437 |  | $ 1,527,437
Material Rights [Member] |  |  |  |  |
Remaining performance obligation amount | $ 454,471 |  | $ 454,471 |  |
Net Sales [Member] | Manufactured Products [Member] |  |  |  |  |
Percentage of attributable to revenue | 86.00% | 87.00% | 86.00% | 87.00% |
Net Sales [Member] | MRO Products [Member] |  |  |  |  |
Percentage of attributable to revenue | 13.00% | 12.00% | 12.00% | 12.00% |

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