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Acquisitions - Summary of Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 01, 2019
Feb. 01, 2019
Aug. 01, 2018
Apr. 30, 2020
Jan. 31, 2020
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Business Acquisition [Line Items]                
Goodwill           $ 660,172 $ 378,109 $ 368,027
Hu-Friedy                
Business Acquisition [Line Items]                
Cash paid $ 662,151              
Fair value of contingent consideration 38,371              
Common stock issued 54,391              
Total 754,913              
Property and equipment 38,571              
Goodwill 276,744              
Deferred income taxes (135)              
Inventories 63,680              
Other working capital 7,053              
Long-term debt 0              
Total 754,913              
Payment for contingent consideration liability       $ 35 $ 25      
Hu-Friedy | Customer relationships                
Business Acquisition [Line Items]                
Amortizable intangible assets 225,000              
Hu-Friedy | Technology                
Business Acquisition [Line Items]                
Amortizable intangible assets 32,000              
Hu-Friedy | Brand names                
Business Acquisition [Line Items]                
Amortizable intangible assets $ 112,000              
Omnia S.p.A.                
Business Acquisition [Line Items]                
Cash paid   $ 15,797            
Fair value of contingent consideration   0            
Common stock issued   3,210            
Total   19,007            
Property and equipment   1,285            
Goodwill   10,539            
Deferred income taxes   (2,346)            
Inventories   0            
Other working capital   1,673            
Long-term debt   (5,207)            
Total   19,007            
Omnia S.p.A. | Customer relationships                
Business Acquisition [Line Items]                
Amortizable intangible assets   10,206            
Omnia S.p.A. | Technology                
Business Acquisition [Line Items]                
Amortizable intangible assets   1,257            
Omnia S.p.A. | Brand names                
Business Acquisition [Line Items]                
Amortizable intangible assets   $ 1,600            
CES Business                
Business Acquisition [Line Items]                
Cash paid     $ 17,047          
Fair value of contingent consideration     0          
Common stock issued     0          
Total     17,047          
Property and equipment     539          
Goodwill     6,137          
Deferred income taxes     0          
Inventories     0          
Other working capital     2,271          
Long-term debt     0          
Total     17,047          
CES Business | Customer relationships                
Business Acquisition [Line Items]                
Amortizable intangible assets     8,100          
CES Business | Technology                
Business Acquisition [Line Items]                
Amortizable intangible assets     0          
CES Business | Brand names                
Business Acquisition [Line Items]                
Amortizable intangible assets     $ 0