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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
Jan. 31, 2018
USD ($)
Business Acquisition [Line Items]          
Goodwill       $ 238.1 $ 242.0
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    
Partmo          
Business Acquisition [Line Items]          
Business combination, consideration transferred   $ 12.1      
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