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Equity (Changes in Equity) (Parenthetical) (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2015
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Mar. 31, 2014
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| Statement of Stockholders' Equity [Abstract] | ||||
| Dividends per share | $ 0.81 | $ 0.77 | $ 1.58 | $ 1.48 |