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Acquisitions (Details)
$ in Millions
3 Months Ended
May 01, 2017
USD ($)
employee
Aug. 31, 2016
USD ($)
Oct. 31, 2016
USD ($)
Partmo      
Business Acquisition [Line Items]      
Business combination, consideration transferred   $ 12.1  
Business combination, payments to acquire business   10.9  
Business combination, consideration transferred, payable   $ 1.2  
Business combination, consideration transferred, payable term   3 years  
Northern Technical, L.L.C.      
Business Acquisition [Line Items]      
Business combination, separately recognized transactions, net gains and losses     $ 6.8
Subsequent Event | Hy-Pro Corporation      
Business Acquisition [Line Items]      
Number of employees | employee 110    
Business acquisition, revenue reported by acquired entity for last annual period $ 25.0