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Share-Based Compensation (Market-Based Deferred Stock Units Valuation Assumptions) (Details) (Market-Based Deferred Stock Units [Member])
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6 Months Ended |
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Mar. 31, 2015
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Market-Based Deferred Stock Units [Member]
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| Share-based Compensation Arrangement by Share-based Award [Line Items] | |
| Expected volatility | 19.60% |
| Risk-free interest rate | 0.90% |
| Expected dividend yield | 2.50% |