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Income Taxes (Summary Of Valuation Allowance) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Valuation allowance beginning of year | $ 141,950 | $ 279,700 | $ 235,500
Net release of valuation allowance | (1,800) | (2,800) | (9,100)
Net increase in deferred tax assets for foreign jurisdictions with a full valuation allowance | 37,500 | (134,900) | 53,300
Valuation allowance end of year | $ 177,663 | $ 141,950 | $ 279,700

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- Definition Valuation Allowance, Net Increase (Decrease) In Deferred Tax Assets For Jurisdictions With A Full Valuation Allowance + References No definition available. + Details
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- Definition Valuation allowance, Release of valuation allowance + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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