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Business Combinations (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Aug. 01, 2018
USD ($)
Jul. 31, 2018
USD ($)
acquistion
Jan. 31, 2018
USD ($)
Jan. 31, 2019
USD ($)
Jan. 31, 2018
USD ($)
Jan. 31, 2017
USD ($)
acquistion
Business Acquisition [Line Items]            
Number of businesses acquired | acquistion   2       2
Increase in goodwill   $ 16,000 $ 1,000      
Business combinations, net of cash acquired       $ 1,474,337 $ 5,744 $ 147,879
Adaptive Insights            
Business Acquisition [Line Items]            
Consideration paid for acquisition $ 1,490,917          
Estimated useful life 7 years 7 months 4 days          
Acquisition related costs       25,000    
Transaction costs       $ 67,000    
Customer relationships | Adaptive Insights            
Business Acquisition [Line Items]            
Estimated useful life 9 years 8 months 12 days          
Developed technology            
Business Acquisition [Line Items]            
Increase in intangible assets   $ 12,000 $ 5,000