Basis of Presentation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Dec. 31, 2016 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Sep. 30, 2017 |
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | ||||||
| Increase to accumulated other comprehensive income | $ (174,575) | $ (174,575) | $ (154,115) | |||
| Retained earnings | $ (1,016,892) | $ (1,016,892) | $ (948,830) | |||
| Reduction to income tax expense | $ 1,234 | |||||
| Diluted (in dollars per share) | $ 0.77 | $ 0.91 | $ 2.44 | $ 1.68 | ||
| Accounting Standards Update 2018-02 | ||||||
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | ||||||
| Increase to accumulated other comprehensive income | $ 8,814 | $ 8,814 | ||||
| Retained earnings | $ 8,814 | $ 8,814 | ||||
| Accounting Standards Update 2016-09 | ||||||
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | ||||||
| Diluted (in dollars per share) | $ 0.04 | |||||
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- Definition Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount No definition available.
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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