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Acquisitions (Details)
$ in Millions
3 Months Ended 12 Months Ended
May 01, 2017
USD ($)
Aug. 31, 2016
USD ($)
Oct. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
acquisition
Business Acquisition [Line Items]        
Goodwill     $ 238.2 $ 238.1
Partmo        
Business Acquisition [Line Items]        
Business combination, consideration transferred   $ 12.1    
Hy-Pro Corporation        
Business Acquisition [Line Items]        
Business acquisition, percentage of voting interests acquired 100.00%      
Business combination, consideration transferred $ 21.9      
Business Combination, Consideration Transferred, Cash Received, Goodwill Adjustment     $ 0.8  
Industrias Partmo S.A. and Hy-Pro Corporation        
Business Acquisition [Line Items]        
Number of businesses acquired | acquisition       2
Business combination, recognized identifiable assets acquired and liabilities assumes, tangible assets, net       $ 18.1
Finite-lived intangible assets acquired       8.6
Goodwill       $ 7.3
Minimum | Industrias Partmo S.A. and Hy-Pro Corporation        
Business Acquisition [Line Items]        
Finite-lived intangible asset, useful life       7 years
Maximum | Industrias Partmo S.A. and Hy-Pro Corporation        
Business Acquisition [Line Items]        
Finite-lived intangible asset, useful life       20 years