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Acquisitions (Narrative) (Details) - USD ($)
12 Months Ended
Jan. 23, 2019
Dec. 19, 2018
Jul. 03, 2018
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Dec. 17, 2018
Business Acquisition [Line Items]              
Consideration transferred, equity interests       $ 44,800,000 $ 0 $ 0  
Term Loan              
Business Acquisition [Line Items]              
Face amount             $ 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) 116,279            
Goodwill       0      
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)   602,051          
Goodwill       0      
PlanGrid | Restricted Stock Units (RSUs)              
Business Acquisition [Line Items]              
Consideration transferred, number of restricted stock units (in shares)   41,069          
Assemble Systems Inc              
Business Acquisition [Line Items]              
Payments to acquire businesses     $ 38,200,000        
Consideration transferred, equity interests     44,800,000        
Consideration     $ 93,600,000        
Stock issued (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        
Goodwill       $ 0