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Business Combinations (Pro Forma) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Business Combinations [Abstract]    
Total revenues $ 2,886,057 $ 2,228,917
Net loss $ (425,604) $ (529,404)
Net loss per share, basic and diluted (usd per share) $ (1.96) $ (2.55)