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Acquisitions (Narrative) (Details)
12 Months Ended
Jan. 23, 2019
USD ($)
shares
Dec. 19, 2018
USD ($)
shares
Jul. 03, 2018
USD ($)
shares
Jan. 31, 2020
USD ($)
Jan. 31, 2019
USD ($)
business_combination
Jan. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]              
Consideration transferred, equity interests     $ 44,800,000 $ 0 $ 44,800,000 $ 0  
Goodwill       0      
Number of businesses acquired | business_combination         3    
Term Loan              
Business Acquisition [Line Items]              
Face amount       $ 450,000,000.0     $ 500,000,000.0
BuildingConnected, Inc.              
Business Acquisition [Line Items]              
Consideration transferred $ 253,200,000            
Payments to acquire businesses 248,100,000            
Consideration transferred, equity interests $ 5,100,000            
Consideration transferred, number of options (in shares) | shares 116,279            
PlanGrid              
Business Acquisition [Line Items]              
Consideration transferred   $ 777,600,000          
Payments to acquire businesses   772,400,000          
Consideration transferred, equity interests   $ 5,200,000          
Consideration transferred, number of options (in shares) | shares   602,051          
PlanGrid | Restricted Stock Units (RSUs)              
Business Acquisition [Line Items]              
Consideration transferred, number of restricted stock units (in shares) | shares   41,069          
Assemble Systems Inc              
Business Acquisition [Line Items]              
Payments to acquire businesses     38,200,000        
Consideration     $ 93,600,000        
Stock issued (shares) | shares     340,769        
Equity interest prior to acquisition     $ 10,600,000        
Ownership percentage prior to acquisition     14.00%        
Step acquisition remeasurement gain     $ 4,600,000