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Acquisitions (Details)
$ in Millions
12 Months Ended
May 01, 2017
USD ($)
Aug. 31, 2016
USD ($)
Jul. 31, 2017
USD ($)
acquisition
Jul. 31, 2016
USD ($)
Aug. 31, 2015
Jul. 31, 2015
USD ($)
Sep. 30, 2014
Business Acquisition [Line Items]              
Acquired finite-lived intangibles     $ 8.6 $ 6.6      
Goodwill     $ 238.1 $ 229.3   $ 223.7  
Hy-Pro Corporation              
Business Acquisition [Line Items]              
Business combination, percentage of voting interests acquired 100.00%            
Business combination, consideration transferred $ 22.7            
Industrias Partmo S.A.              
Business Acquisition [Line Items]              
Business combination, consideration transferred   $ 12.1          
Business combination, consideration transferred, payments to acquire business   10.9          
Business combination, consideration transferred, payable   $ 1.2          
Business combination, consideration transferred, payable term   3 years          
2017 Acquisitions              
Business Acquisition [Line Items]              
Business combination, number of business acquisitions | acquisition     2        
Business combination, net tangible assets acquired     $ 19.5        
Acquired finite-lived intangibles     8.6        
Goodwill     6.7        
Engineered Products Company              
Business Acquisition [Line Items]              
Business combination, percentage of voting interests acquired         100.00%    
Northern Technical, L.L.C.              
Business Acquisition [Line Items]              
Business combination, percentage of voting interests acquired             100.00%
Business combination, favorable settlement claim     $ 6.8        
Minimum | 2017 Acquisitions              
Business Acquisition [Line Items]              
Acquired finite-lived intangible assets, weighted average useful life     7 years        
Maximum | 2017 Acquisitions              
Business Acquisition [Line Items]              
Acquired finite-lived intangible assets, weighted average useful life     20 years