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Acquisitions - Fair Value of Assets Assumed and Liabilities Acquired (Details) - USD ($)
$ in Millions
Dec. 29, 2019
Jan. 02, 2019
Dec. 30, 2018
Sep. 05, 2017
Business Acquisition [Line Items]        
Goodwill $ 127.8   $ 107.3  
NextGen Global Resources LLC        
Business Acquisition [Line Items]        
Cash   $ 3.5    
Trade accounts receivable   19.7    
Other current assets   0.3    
Goodwill   13.7    
Intangibles   21.5    
Other noncurrent assets   0.5    
Current liabilities   (4.9)    
Purchase price paid, including working capital adjustments   54.3    
Global Technology Associates, LLC        
Business Acquisition [Line Items]        
Cash   0.1    
Trade accounts receivable   13.9    
Other current assets   0.1    
Goodwill   6.8    
Intangibles   17.3    
Other noncurrent assets   0.4    
Current liabilities   (2.9)    
Purchase price paid, including working capital adjustments   $ 35.7    
Teachers On Call, Inc.        
Business Acquisition [Line Items]        
Cash       $ 1.8
Other current assets       3.6
Goodwill       18.7
Intangibles       18.3
Other noncurrent assets       0.5
Current liabilities       (3.9)
Purchase price paid, including working capital adjustments       $ 39.0