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Retirement Benefits (Schedule of Costs of Retirement Plans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Retirement Benefits [Abstract] |  |  |  |
Company Costs - Defined Contribution | $ 8,716 | $ 8,502 | $ 16,595 | $ 15,751
Company Contributions - Multiemployer plan | $ 87 | $ 79 | $ 167 | $ 147

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