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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2007 | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014
Net operating loss carryforwards recognized | $ 8.0 |  |  |
Net operating loss carryforwards amount |  |  | $ 73.8 |
Tax refund on amended returns |  |  | 6.2 |
Reduction in federal tax liability |  |  | 19.6 |
Current Fiscal Year End Date |  | --07-31 |  |
Unrecognized tax benefits, income tax penalties and interest accrued |  | $ 1.6 | 0.5 |
Income tax examination, penalties and interest expense |  | 1.1 | (1.4) | $ 0.1
Unrecognized Tax Benefits, Period Increase (Decrease) |  |  | (27.7) |
Tax Adjustments, Settlements, and Unusual Provisions |  |  | $ 23.8 |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign |  | 0.9 |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | 0.9 |  |
State and Local Jurisdiction [Member] |  |  |  |
State operating loss carryforwards |  | 34.1 |  |
Operating loss carryforwards, valuation allowance |  | $ 29.2 |  |

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