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Basis of Presentation New Accounting Pronouncements Adopted (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Oct. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net benefit costs reclassified into other income (deductions), net | $ (1,067) | $ (1,596) | $ (1,991) | $ (3,680) |
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 |  | 1,428 |
Net benefit costs reclassified into other income (deductions), net |  | 714 |  | 1,428 |
Selling Expense | Accounting Standards Update 2017-07 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Adoption of ASU 2017-07 |  | 226 |  | 452 |
Net benefit costs reclassified into other income (deductions), net |  | 226 |  | 452 |
Administrative Expense | Accounting Standards Update 2017-07 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Adoption of ASU 2017-07 |  | 485 |  | 970 |
Net benefit costs reclassified into other income (deductions), net |  | $ 485 |  | $ 970 |
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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