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Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 12, 2017
Jul. 29, 2017
Aug. 04, 2018
Feb. 03, 2018
Jan. 28, 2017
Business Acquisition [Line Items]          
Goodwilll, acquired during period   $ 301.7      
Goodwill   $ 519.9 $ 509.0 $ 821.7 $ 517.6
R2Net Inc.          
Business Acquisition [Line Items]          
Cash and cash equivalents $ 47.3        
Inventories 12.1        
Other current assets 9.7        
Property, plant and equipment 3.5        
Current liabilities (42.4)        
Deferred tax liabilities (25.1)        
Fair value of net assets acquired 79.9        
Goodwilll, acquired during period 299.1        
Total consideration transferred 379.0        
Trade names | R2Net Inc.          
Business Acquisition [Line Items]          
Intangible assets 70.6        
Technology-related | R2Net Inc.          
Business Acquisition [Line Items]          
Intangible assets $ 4.2