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Acquisitions (Narrative)(Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 03, 2018
Jul. 31, 2018
Jul. 31, 2017
Business Acquisition [Line Items]      
Document Period End Date   Jul. 31, 2018  
Stock issued   $ 44.8 $ 0.0
Assemble Systems Inc      
Business Acquisition [Line Items]      
Consideration $ 93.6    
Payments to acquire businesses 38.2    
Stock issued $ 44.8    
Stock issued (shares) 340,769    
Equity interest prior to acquisition $ 10.6    
Ownership percentage prior to acquisition 14.00%    
Step acquisition remeasurement gain $ 4.6