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Income Taxes (Tax Expense and Effective Tax Rate) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013
Income Taxes |  |  |  |
Earnings before income taxes | $ 56,756 | $ 50,336 | $ 89,700 | $ 88,873
Income tax expense | $ 11,958 | $ 7,890 | $ 21,519 | $ 19,059
Effective tax rate | 21.10% | 15.70% | 24.00% | 21.40%

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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