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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Sep. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Unrecognized Tax Benefits | $ 3.5 |  |  | $ 3.3
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 35.00% |
State income taxes, net of federal benefit | 4.50% | 3.30% |  |
Tax benefits from stock compensation | (1.50%) | (1.30%) |  |
Tax credits | (1.10%) | (0.40%) |  |
Other | 1.50% | (0.30%) |  |
Walter Energy accrual | (0.30%) | (5.80%) |  |

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