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Acquisitions - Hu-Friedy (Details) - USD ($)
12 Months Ended
Oct. 01, 2019
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Business Acquisition [Line Items]        
Acquisition of business, net of cash acquired   $ 721,350,000 $ 40,644,000 $ 87,488,000
Hu-Friedy        
Business Acquisition [Line Items]        
Total consideration excluding contingent consideration $ 716,542,000      
Acquisition of business, net of cash acquired 662,151,000      
Common stock issued 54,391,000      
Contingent consideration 38,371,000 $ 0    
Minimum | Hu-Friedy        
Business Acquisition [Line Items]        
Contingent consideration 0      
Maximum | Hu-Friedy        
Business Acquisition [Line Items]        
Contingent consideration $ 50,000,000