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Basis of Presentation New Accounting Pronouncments Adopted (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net benefit costs reclassified into other income (deductions), net | $ (924) | $ (2,084)
Accounting Standards Update 2016-16 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative tax adjustment for intra-entity transfers | (4,176) |
Cost of Sales | Accounting Standards Update 2017-07 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Adoption of ASU 2017-07 |  | 714
Net benefit costs reclassified into other income (deductions), net |  | 714
Selling Expense | Accounting Standards Update 2017-07 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Adoption of ASU 2017-07 |  | 226
Net benefit costs reclassified into other income (deductions), net |  | 226
Administrative Expense | Accounting Standards Update 2017-07 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Adoption of ASU 2017-07 |  | 485
Net benefit costs reclassified into other income (deductions), net |  | $ 485
Retained Earnings | Accounting Standards Update 2016-16 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative tax adjustment for intra-entity transfers | (4,176) |
Other Assets | Accounting Standards Update 2016-16 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative tax adjustment for intra-entity transfers | $ (4,176) |

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