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Acquisitions (Schedule of components of acquisitions, net of cash acquired) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 30, 2023
Apr. 30, 2023
Jul. 31, 2022
Apr. 30, 2022
Business Acquisition        
Goodwill $ 380.3 $ 380.3 $ 345.8  
Less deferred tax liability (10.9) (10.9)    
Acquisitions, net of cash acquired   62.3   $ 49.0
Isolere        
Business Acquisition        
Intangible assets:     44.5  
Tangible assets, net     3.3  
Assets acquired, net     47.8  
Goodwill 28.1 $ 28.1 28.1  
Aggregate purchase price     75.9  
Less deferred tax liability     (10.9)  
Less cash acquired     (2.7)  
Acquisitions, net of cash acquired $ 62.3   62.3  
Technology | Isolere        
Business Acquisition        
Intangible assets:     41.7  
Trademarks and tradenames | Isolere        
Business Acquisition        
Intangible assets:     1.5  
Non-competition agreements | Isolere        
Business Acquisition        
Intangible assets:     $ 1.3