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Retirement Benefits (Schedule of Costs of Retirement Plans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Retirement Benefits [Abstract] |  |  |  |
Company Costs - Defined Contribution | $ 8,262 | $ 8,039 | $ 24,858 | $ 23,790
Company Contributions - Multiemployer plan | $ 86 | $ 73 | $ 253 | $ 220

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