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Acquisitions (Details)
€ in Millions, $ in Millions
12 Months Ended
Sep. 11, 2018
USD ($)
Sep. 11, 2018
EUR (€)
May 01, 2017
USD ($)
Aug. 31, 2016
USD ($)
Jul. 31, 2018
USD ($)
acquisition
Jul. 31, 2017
USD ($)
Jul. 31, 2016
USD ($)
Aug. 31, 2015
Business Acquisition [Line Items]                
Goodwill         $ 238.4 $ 238.1 $ 229.3  
Hy-Pro Corporation                
Business Acquisition [Line Items]                
Business combination, percentage of voting interests acquired     100.00%          
Business combination, consideration transferred     $ 21.9          
Business combination, consideration transferred, cash received         $ 0.8      
Industrias Partmo S.A.                
Business Acquisition [Line Items]                
Business combination, consideration transferred       $ 12.1        
2017 Acquisitions                
Business Acquisition [Line Items]                
Business combination, number of business acquisitions | acquisition         2      
Business combination, net tangible assets acquired         $ 18.1      
Acquired finite-lived intangibles         8.6      
Goodwill         $ 7.3      
Engineered Products Company                
Business Acquisition [Line Items]                
Business combination, percentage of voting interests acquired               100.00%
Minimum | 2017 Acquisitions                
Business Acquisition [Line Items]                
Acquired finite-lived intangible assets, weighted average useful life (in years)         7 years      
Maximum | 2017 Acquisitions                
Business Acquisition [Line Items]                
Acquired finite-lived intangible assets, weighted average useful life (in years)         20 years      
Subsequent Event | BOFA International LTD                
Business Acquisition [Line Items]                
Business combination, percentage of voting interests acquired 88.00% 88.00%            
Business combination, consideration transferred | €   € 79            
Business combination, percentage of remaining voting interests acquired 12.00% 12.00%            
Sales expected from acquired business $ 40.0