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Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 18, 2018
Jul. 31, 2019
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Business Acquisition [Line Items]          
Cash consideration     $ 96.0 $ (0.5) $ 32.2
BOFA International LTD          
Business Acquisition [Line Items]          
Business combination, percentage of voting interests acquired 88.00%        
Cash consideration $ 98.2        
Cash acquired $ 2.2        
Additional ownership percentage acquired   3.00%      
Period that exercise of options triggers purchase obligation 3 years        
Voting interest acquired (percentage) 12.00% 9.00% 9.00%    
Minimum | BOFA International LTD          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets, weighted average useful life (in years) 5 years        
Maximum | BOFA International LTD          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets, weighted average useful life (in years) 15 years        
BOFA International LTD          
Business Acquisition [Line Items]          
Ownership percentage   91.00% 91.00%