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Acquisitions (Schedule of components of acquisitions, net of cash acquired) (Details) - USD ($)
$ in Millions
6 Months Ended 9 Months Ended
Jan. 31, 2023
Jan. 31, 2022
Jul. 31, 2022
Business Acquisition      
Goodwill $ 350.2   $ 345.8
Acquisitions, net of cash acquired $ 0.0 $ 49.0  
2022 Acquisitions      
Business Acquisition      
Intangible assets:     53.7
Tangible liabilities, net     (2.7)
Assets acquired, net     51.0
Goodwill     42.8
Aggregate purchase price     93.8
Less contingent consideration     (24.6)
Less cash acquired     (0.3)
Acquisitions, net of cash acquired     68.9
Technology | 2022 Acquisitions      
Business Acquisition      
Intangible assets:     45.9
Trademarks and tradenames | 2022 Acquisitions      
Business Acquisition      
Intangible assets:     4.0
Customer Relationships | 2022 Acquisitions      
Business Acquisition      
Intangible assets:     3.0
Non-competition agreements | 2022 Acquisitions      
Business Acquisition      
Intangible assets:     0.6
Backlog | 2022 Acquisitions      
Business Acquisition      
Intangible assets:     $ 0.2