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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2007
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
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
Unrecognized tax benefits, income tax penalties and interest accrued   $ 3.6 $ 1.6  
Income tax examination, penalties and interest expense   (2.0) $ (1.1) 1.4
Unrecognized Tax Benefits, Period Increase (Decrease)       27.7
Tax Adjustments, Settlements, and Unusual Provisions       $ 23.8
Deferred Tax Assets, Tax Credit Carryforwards, Foreign   9.9    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   4.2    
State and Local Jurisdiction [Member]        
State operating loss carryforwards   34.5    
Operating loss carryforwards, valuation allowance   $ 29.5