Annual report pursuant to Section 13 and 15(d)

Business Acquisitions (Summary of Intangible Assets Acquired) (Details)

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Business Acquisitions (Summary of Intangible Assets Acquired) (Details) - USD ($)
$ in Thousands
May 01, 2019
Apr. 01, 2019
Jan. 02, 2019
Jan. 02, 2018
FolioDynamix acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount       $ 135,700
PortfolioCenter acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount   $ 11,700    
PIEtech Acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount $ 253,000      
Customer list | FolioDynamix acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount       $ 113,500
Intangible assets acquired, Estimated Useful Life In Years       13 years
Customer list | PortfolioCenter acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount   $ 8,500    
Intangible assets acquired, Estimated Useful Life In Years   10 years    
Customer list | PIEtech Acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount 222,000      
Proprietary technology | FolioDynamix acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount       $ 17,500
Intangible assets acquired, Estimated Useful Life In Years       5 years
Proprietary technology | Private AI company acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount     $ 4,100  
Intangible assets acquired, Estimated Useful Life In Years     4 years  
Proprietary technology | PortfolioCenter acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount   $ 3,200    
Intangible assets acquired, Estimated Useful Life In Years   5 years    
Proprietary technology | PIEtech Acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount $ 23,000      
Intangible assets acquired, Estimated Useful Life In Years 4 years      
Trade names and domains | FolioDynamix acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount       $ 4,700
Intangible assets acquired, Estimated Useful Life In Years       6 years
Trade names | PIEtech Acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount $ 8,000      
Intangible assets acquired, Estimated Useful Life In Years 7 years      
Preliminary Estimate | PortfolioCenter acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount   $ 12,400    
Preliminary Estimate | PIEtech Acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount $ 217,000      
Preliminary Estimate | Customer list | PortfolioCenter acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount   9,100    
Preliminary Estimate | Customer list | PIEtech Acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount 181,000      
Preliminary Estimate | Proprietary technology | PortfolioCenter acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount   3,300    
Preliminary Estimate | Proprietary technology | PIEtech Acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount 25,000      
Preliminary Estimate | Trade names | PIEtech Acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount 11,000      
Measurement Period Adjustments | PortfolioCenter acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount   (700)    
Measurement Period Adjustments | PIEtech Acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount 36,000      
Measurement Period Adjustments | Customer list | PortfolioCenter acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount   (600)    
Measurement Period Adjustments | Customer list | PIEtech Acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount 41,000      
Measurement Period Adjustments | Proprietary technology | PortfolioCenter acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount   $ (100)    
Measurement Period Adjustments | Proprietary technology | PIEtech Acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount (2,000)      
Measurement Period Adjustments | Trade names | PIEtech Acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Amount $ (3,000)      
Minimum | Customer list | PIEtech Acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Estimated Useful Life In Years 10 years      
Maximum | Customer list | PIEtech Acquisition        
Business Acquisition [Line Items]        
Intangible assets acquired, Estimated Useful Life In Years 20 years