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Goodwill and Other Intangible Assets (Expected Amortization Expense Relating To Existing Intangible Assets) (Details) - USD ($)
$ in Millions
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2018 $ 5.4    
2019 5.2    
2020 4.9    
2021 4.7    
2022 3.6    
Thereafter 16.8    
Total expected amortization expense $ 40.6 $ 38.5 $ 37.9