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Debt:2030 Notes (Details) - USD ($) $ in Thousands | 1 Months Ended | 2 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |
Repayments of Long-term Debt |  |  | $ 405,774 | $ 5,500 |
Term Loan Due 2026 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of Long-term Debt | $ 45,000 |  |  |  | $ 30,000
4.875% Senior Notes Due 2030 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Dividend restriction, interest coverage ratio (as a percent) |  | 350.00% |  |  |

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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